Features

20 Hz to 20 kHz frequency response Up to 11 simultaneous effects (6 analog, 5 digital) and programmable effects loop Backlit, descriptive 32 character LCD display Touch sensitive programming buttons for quick editingpress harder to scroll faster through the display Stores up to 100 programs Comprehensive MIDI implementation Real-time parameter control via MIDI controllers Easy editing of all parameters All functions, parameters, and volume levels fully programmable Stereo in and out Flexible effects routing and mixing Several types of reverbs, including: Plate, Room, Chamber, Hall, and Reverse Several types of delay, including: Ping Pong Delay, Mono Delay, Stereo Delay, and Multitap delay Several types of Pitch Shift, including: Mono Chorus, Stereo Chorus, Mono Flange, Stereo Flange, Pitch Detune, and Phase Shifter Three types of Digital EQ, including: 3 band Parametric, 5 band Parametric, and 11 band Graphic Any or all Alesis presets can be recalled from ROM at any time

1.2 SYSTEM HOOKUP BASICS

The QuadraVerb GT is designed for mono or stereo guitar, bass, Chapman Stick, etc. but is also right at home in the studio for processing vocals, drums, pianos, synthesizers (try the rotating speaker sound!), tape tracks, and other instruments. The QuadraVerb GT can insert between your guitar and subsequent effects units or amplification systems. This lets you use the amp's overdrive options to further color the QuadraVerb GT's sound. Or, patch the QuadraVerb GT into an amps effects loop. This lets the QuadraVerb GT process the amp's internal sound, and in some cases, lets you use the amplifier's preamp section as an alternate to the QuadraVerb GT's internal preamp. Following are some typical hookups, followed by information on proper
level-setting. All inputs and outputs are unbalanced lines. Turn your amplifier volume all the way down when patching the QuadraVerb GT into your system!

AC Transformer Hookup

Plug the QuadraVerb GT's AC adapter into the wall. The smaller plug inserts into the 9 VAC power jack on the QuadraVerb GT's rear panel. To prolong the AC adapter's life, unplug it from AC power when not in use (turning off the QuadraVerb GT's power switch does not disconnect the AC adapter from AC power). It's good practice to plug all your ACpowered devices into a switched power strip, so that turning off the strip turns off power to all your gear.

1.3 AUDIO HOOKUPS

The QuadraVerb GT can interface with a variety of guitar systems and recording studio setups.

Interfacing with Mixer Stereo Effects Sends

From mixer sends

to mixer returns

Left Input

Left Output
Application Patching into a mixer's stereo effects sends for use as a reverb or other processor while recording. Hookup Patch the mixer's auxiliary bus (or effects bus) sends into the right and left QuadraVerb GT inputs, and patch the QuadraVerb GT's right and left outputs to the mixer's stereo returns or if not available, two standard mixer channel inputs.

1.4 FOOTSWITCH HOOKUP

There are two footswitch jacks on the rear panel that accept standard, normally open, momentary contact footswitches. A footswitch plugged into the Bypass jack duplicates the BYPASS button function. Press on the footswitch to toggle between bypass and active modes. When bypassed, the LED in the middle of the BYPASS button will be lit. A footswitch plugged into the Advance jack increments (or decrements)
the program number by one with each footswitch press. You can set an upper and lower program number limit, as described in section 5.7.
1.5 EXTERNAL EFFECTS HOOKUP
The QuadraVerb GT offers an effects loop where you can patch in effects other than the ones included in the unit (you might want to insert, for example, a wah-wah pedal or vintage fuzz). The effect can be bypassed or enabled for each patch. Patch the Effects Loop Send jack to the effect input, and the Effects Loop Receive jack to the effect output. Also note that the Send jack provides a post-analog effects, pre-digital effects send suitable for driving guitar amps or a studio console; the Receive jack lets you plug directly into the digital effects and bypass the analog effects. The effects loop can therefore split the QuadraVerb GT into two separate effects, as described in section 2.1. It is important to note that turning off the effects loop does not turn off the effects send. Selecting In or Out on the Effects Loop page will only enable or disable the Effects Loop Return jack. Also, the effects loop will be bypassed if there are no jacks inserted, regardless of whether the Effects Loop page is set to On or Off.

1.6 SETTING LEVELS

After hooking up your cables, set the proper levels. Start off with your amplifier turned down to a low volume to prevent any ear-shattering surprises as you learn about the QuadraVerb GT. After you know what you're doing, increase the level to normal monitoring levels. 1. Press the BYPASS button (its red LED will light) so that you hear only the straight guitar sound. 2. Play your instrument and observe the 4-step LED meter toward the left of the QuadraVerb GT. 3. Adjust the Input control so that the -6 dB LED lights consistently but the Clip (red) LED lights rarely, if ever. The red LED indicates that distortion is either about to occur or is actually occurring. 4. Adjust the output control for a comfortable monitoring level. Make sure the output is turned up high enough to provide the amplifier, mixer, or subsequent processor with sufficient level, but not turned up so high that it overloads the unit it is feeding. 5. Press the BYPASS button again so that you can hear the effect of the different QuadraVerb GT programs. BYPASS can be used at any time to toggle between processed and straight sounds.

1.7 CHECK OUT THE FACTORY PROGRAMS
The QuadraVerb GT contains 90 programs that put your guitar through serious sonic gyrations. Initially, these programs contain factory presets. However, they can be edited or replaced with your own programs. You can also recall the original factory sound associated with a program location at any time, even if that location has been modified or erased, because the parameters for these programs are stored in ROM (permanent memory). Assuming you've hooked up your guitar as described in the previous section, it's time to audition the QuadraVerb GT programs and see what this baby can do.

Selecting Programs

1. Press the PROGRAM (PROG) button. The LED in the middle of the button will light. 2. There are three ways to select programs: MIDI program changes. See next section. Press either VALUE button to scroll through the available programs (VALUE UP increases the program number, VALUE DOWN decreases the program number). The harder you press the VALUE button, the faster the Program numbers will scroll. Stop on a program, and it will be selected. Key in a particular two-digit program number. Note that the module buttons (REVERB, DELAY, PITCH, etc.) also have numbers printed in gray. These can be used for entering numbers as long as the PROGRAM button is held down. Example: To enter program 56, press the PROGRAM button and while it is being held down, press the 5 (MIDI) and 6 (CONFIG) buttons. The display will show 56, and that program will be selected. If you release the PROGRAM button before entering the two digit program number, the program number will revert to what it was before you pressed the PROGRAM button. The number you enter must be a two-digit number, so enter a leading zero if necessary. Example: To enter program 9, enter 09.

1.8 MIDI HOOKUP

MIDI is an internationally-accepted protocol that allows musical-related data to be conveyed from one device to another. See the MIDI supplement if you are not familiar with how MIDI works. The most popular MIDI applications are hooking up a MIDI footswitch to change programs, and/or a MIDI continuous controller pedal to vary QuadraVerb GT parameters in real time, as you play. The following sections describe how this process works.

MIDI Program Selection

Multi Tap delay is also available in this mode along with the standard mono, stereo, and ping-pong delays. Up to eight taps are available along the delay line; each tap has variable delay time, panning, volume, and feedback. For more details about multitap delays, see section 4.5. Panning and Tremolo are available in this configuration, and are in series with the EQ signal line. The Preamp Signal Pre/Post EQ switch chooses whether the Preamp Output comes from before or after the EQ.
#5 Preamp > 3 Band EQ > Reverb

Configuration 5

Reverb Input INPUT
REVERB + CHORUS PREAMP 3 BAND EQ
Preamp Pre/Post EQ Delay Output Effects Output
This is the recommended configuration when you want the best possible reverb sound. By restricting the number of effects, the QuadraVerb GT can devote its full computing power to creating awesome reverberation effects. However, EQ is still available for additional tone shaping, as is a simpler version of chorusing.
#6 Preamp > Ring Modulator > Delay > Reverb

Configuration 6

Ouput Shift Mix Up INPUT Delay Input Mix

Reverb Input 1

REVERB PREAMP RING MOD
Down Delay & Reverb Shift Mix
Reverb Input 2 Reverb Output Delay Output Effects Output

Ring Modulator Output

This configuration features the Ring Modulation in conjunction with Delay and Reverb. The Ring Modulator is not available in other configurations. The Ring Modulator produces two outputs, both of which are mathematically derived (sum and difference frequencies) from the input signal. The Ring Modulator output can pan between these two output signals, as can the Delay & Reverb Shift Mix control, which chooses a blend of both outputs to send to the Delay and Reverb inputs.
#7 Preamp > Resonators > Delay > Reverb

Configuration 7

Reverb Input 1 Delay Input Mix

RESON 1

RESON 2 PREAMP RESON 3 RESON 4 RESON 5
Resonator Output Reverb Input 2

REVERB

Reverb Output Delay Output Effects Output

This configuration features the Resonators in conjunction with Delay and Reverb.

#8 Preamp > Sampling

Configuration 8
Trigger Audio Trigger MIDI Note Looping On-Off Start

Length

Trigger In

Pitch In

Sampling Output

SAMPLING

Pre-Amp Signal OUTPUT
In this configuration, you can record sounds (processed by the Preamp if desired) into the QuadraVerb GT and play them back in a variety of ways.
CHAPTER 3 - BASIC EDITING TECHNIQUES
Editing is the key to using the QuadraVerb GT to its fullest potential. If you like a sound but want more reverb, less treble, more distortion, or whatever, editing is the answer. Make sure that if you develop a custom set of programs, that you save your data to some form of MIDI system exclusive storage device, like the Alesis DataDisk (see sections 5.5-5.6).

3.1 HOW EDITING WORKS

The QuadraVerb GT contains five Effects Groups, each with its own corresponding front panel selection button: Reverb, Delay, Pitch, Equalization (EQ), and Guitar Preamp (Pre-Amp). These all contain editable parameters. Four other editable functions (with front panel buttons) are also available: MIDI, Name/Mod, Mix, and Configuration. The basic editing procedure is the same for whatever you want to edit; well get into specifics later.
1. Select What You Want to Edit
Push the button associated with the Effect Group (Reverb, Delay, Pitch, EQ, Preamp) or function (MIDI, Config, Mix, Mod) you want to edit. The LED in the middle of the button will light.
2. Select the Page with the Parameter to be Edited
Each effect/function includes several pages. Each page shows the name and value of one (or sometimes more) parameters, and each parameter controls some particular aspect of the QuadraVerb GTs sound or operation. Most effects or functions require multiple pages to show all available parameters. The page's upper display line shows the parameter name, and the lower line, the parameter value. Press the PAGE UP and DOWN buttons to select a page containing a parameter to be edited. The harder you press the PAGE button, the faster the pages will scroll. NOTE: The NAME/MOD button is the exception to this rule,as it

3.6 RECALLING ALL FACTORY PROGRAMS
1. Press STORE. The LED in the middle of the button will light. 2. Press the PAGE UP button three times. The display says: RECALL ALL 90 ALESIS PROGRAMS 3. Press STORE and all the program locations will be occupied by factory programs. Any other data will be overwritten.
CHAPTER 4 EDITING CONFIGURATION PARAMETERS
In this section, well describe how to select a configuration, then how to edit the parameters for each configuration. Please refer to the configuration block diagrams in section 2.2 for details on how particular mixing and switching parameters work with a particular configuration. Remember that after selecting a configuration, the PAGE buttons select the various pages with different parameters. If a page has more than one parameter, the PAGE buttons also move between those parameters. Once a parameter is selected, as indicated by a cursor (small underline), use the VALUE buttons to change the parameter value. Sampling is such a different type of application that it has its own chapter. All sampling parameters are covered in that chapter. Important! In many of the following sections, a diagram will show what you can expect to see when you call up a particular page. The parameter value shown for each page will usually be representative, but when you actually call up the page on the QuadraVerb GT, a different parameter value from the one shown in the manual may appear.
4.1 SELECTING A CONFIGURATION
1. Select the program whose configuration you want to change or edit. 2. Press the CONFIG button. The LED in the middle of the button will light. 3. Use the VALUE buttons to select the desired configuration.
4.2 SELECTING A CONFIGURATION MODULE FOR EDITING
After selecting the desired configuration, press the button associated with the module you want to edit (REVERB, DELAY, PITCH, EQ, or MIX). If the module is not used in a particular configuration, the display briefly says: NOT USED IN THIS CONFIGURATION
4.3 EDITING PREAMP PARAMETERS
Since all configurations use the Preamp section, well describe those edits first. Press the PRE-AMP button. Its LED will light and the first page will show the compression amount. Use the PAGE buttons to access the various pages described below.

Compression

A compressor reduces the guitar's dynamic range to increase sustain and even out amplitude peaks. Recordings often use compression to give a smooth guitar sound. Compression is an important first link in any guitar effects chain. COMPRESSION: 07 There are seven compression amounts (1-7) with higher numbers giving more compression. Compression can also be turned off.

Overdrive

The Overdrive stage provides a rhythm guitar crunch type of sound as opposed to the smoother, more biting Distortion module (which is used more for leads). The overdrive stage also gives a fuller, more harmonically dense sound than the Distortion module. The QuadraVerb GT's Overdrive stage utilizes both odd and even order harmonics to

Preamp Out Level

The display says: PREAMP OUT LEVEL 00 The Preamp Out Level is located in the Quadraverb GT's digital section, post-effects return. It controls the level of all of the analog effects as they are fed into the processor that generates all of the QuadraVerb GT's digital effects. Proper adjustment of the Preamp Out Level allows you to prevent overloading of this processor without sacrificing the input level necessary to provide sufficient gain to drive the QuadraVerb GT's analog section properly. To set the Preamp Out Level, do the following:
1. Press the BYPASS button and play your guitar. Even though you won't hear any effects, check the QuadraVerb GT's input level meter. If the red clip light still lights, turn down the Input knob. 2. If the clip LED doesn't light with the BYPASS button pressed, press it again to disengage the bypass function. Play your guitar and decrease the Preamp Out Level until the level indicator stops clipping.
4.4 EDITING REVERB PARAMETERS
Reverb Type (configs 1, 2, 5, 6, 7)
In configuration 5, the following reverb type parameters are followed by the number 2 instead of 1 to remind you that this configuration uses the ultra-high-performance reverb algorithm. Plate 1 Provides a bright reverb sound that's popular with vocals and snares. Room 1 You can program the room's size and surface (harder or softer). Chamber 1 Simulates the acoustic echo chambers that were built into studios prior to the days of high-quality electronic reverb. Hall 1 This provides a concert hall ambience with long, dense reflections. Reverse 1 This type of reverb does not exist in nature; reflections get louder over time, until they are cut off upon reaching a maximum volume level.
Reverb Input 1 (configs 1, 2, 6, 7)
The number in [brackets] indicates the configuration in which the parameter is found. Multiple numbers indicate that the parameter is found in more than one configuration. Preamp Output [1, 2, 6, 7] The reverb input signal comes from the preamp output. EQ Output [1] The reverb input signal comes after the EQ module. Lezlie Output [2] The reverb input signal comes after the Lezlie
module. Ring Output [6] The reverb signal comes from the Resonator Output. Resonator Output [7] The reverb signal comes from the Resonator Output. Pitch Output [1] The reverb signal comes from the pitch module output. Delay Mix Input [1, 2, 6, 7] The reverb signal comes from the Delay input, which consists of a blend, selected by the Delay Input Mix parameter, of the pitch output and either pre- or post-EQ signal (as selected by the Delay Input 1 switch).

Reverb Input (config 5)

Preamp Output [5] The reverb input signal comes from the preamp output. EQ Output [5] The reverb input signal comes after the EQ module.
Reverb Input 2 (configs 1, 2, 6, 7)
Delay Output [1, 2, 6, 7] The reverb input signal comes from the delay output. Pitch Output [1] The reverb input signal comes from the pitch module output. Lezlie Output [2] The reverb input signal is post-Lezlie. Ring Output [6] The reverb input signal comes from the ring modulator output. Resonator Output [7] The reverb input signal comes from the resonator output.

Multi Tap Volume (config 4 only)
The display says: TAP X VOLUME: 50 X is the number of the tap selected for editing. This sets the volume of the selected tap.
Multi Tap Panning (config 4 only)
The display says: TAP X PANNING: LEFT 00 RIGHT X is the number of the tap selected for editing. This pans the tap output anywhere in the stereo field between full left (99) and full right (99). Center is 00.
Multi Tap Feedback (config 4 only)
The display says: TAP X FEEDBACK: 00% X is the number of the tap selected for editing. Increasing the feedback increases the number of successive echoes this tap will produce; each echo will be softer than its predecessor.
Multi Tap Master Feedback (config 4 only)
The display says: MASTER FEEDBACK: 00% This scales all feedback parameters simultaneously if you want to increase or decrease feedback without having to readjust each taps feedback parameter.
4.6 EDITING PITCH PARAMETERS
Configurations 1, 2, 4, 5, and 6 can access the pitch parameters. However, the pitch parameters are quite different for these configurations. Parameters are covered in the following order: Configurations 1 and 4 use pitch parameters in a relatively traditional manner (chorus, flange, pitch detune, and phase shifter). Configuration 2 uses the pitch module to access Lezlie effects. Configuration 5 uses the pitch module to access Reverb Chorus effects. Configuration 6 uses the pitch module to access Ring Modulator effects.
Pitch Mode (configs 1, 4)
Mono Chorus Splits the signal into two lines: one is unprocessed, while the other has its pitch changed in a cyclical manner. Mixing these two together produces frequency response and amplitude variations that create the sound of multiple instruments playing en ensemble. Stereo Chorus This is similar to mono chorus, but splits the signal into two pairs of two lines (one pair per channel). As the delay time in one channel is increasing, the other channels delay is decreasing and vice-versa. Mono Flange Similar to mono chorus, but with parameters optimized for flanging. This effect imparts a whooshing, jet airplane sound to the signal being processed. Stereo Flange Similar to stereo chorus, but with parameters optimized for flanging. Pitch Detune Detunes a signal slightly sharp or slightly flat. This is often used to obtain 12-string effects from a six-string guitar. Phase Shifter The Phase Shifter shifts the phase of certain frequencies to produce a comb filter effect. This produces a sound that is similar to flanging, but more subtle. IMPORTANT! For the deepest pitch effects, the dry and processed signal levels (found in the Mix section) should be equal (50% dry and 50% effect).

Lezlie Motor Control (config 2 only)
The display says: LEZLIE MOTOR CONTROL: ON
Because the speakers in a mechanical rotating speaker system weigh a lot, they take a while to get up to speed from a dead stop, and take a while to slow down when turned off. Turn this parameter off to slow the speakers down to a stop, or on to speed them up to the speed set on the next page; its a natural for MIDI control (sections 6.1-6.2).
Lezlie Speed (config 2 only)
The display says: LEZLIE SPEED: FAST Mechanical rotating speaker systems generally offer two speeds, slow and fast. The QuadraVerbs simulated rotating speaker gives you two speeds also.
Ring Modulator Spectrum Shift (config 6 only)
The display says: SPECTRUM SHIFT: 100Hz This determines how much the up and down harmonic signals will be shifted with respect to the original input signal.
Ring Modulator Output Mix (config 6 only)
The display says: RING MOD. OUTPUT MIX: DOWN 00UP This varies the balance between the up and down signals. At 00, there is an equal blend of both signals. At 99, the output consists entirely of the
upshifted signal. At 99, the output consists entirely of the downshifted signal. (With the QuadraVerb GT, excessive downshifting will not wear out the clutch. There is no clutch.)
Ring Modulator Delay/Reverb Input (config 6 only)
The display says: DEL/REVERB INPUT MIX: DOWN 00UP The ring modulator signal that can optionally feed the Delay and/or Reverb inputs can consist of any blend of the up and downshifted signals. At 00, there is an equal blend of both signals. At 99, the output consists entirely of the upshifted signal. At 99, the output consists entirely of the downshifted signal.
Reverb Chorus Mode (config 5 only)
The display says: REVERB CHORUS: ON Don't confuse this parameter with the Chorus found in the Pitch module. Turning on the Reverb Chorus will make the reverb modulate and sound "swimmy".
4.7 A WORD ABOUT EQ, RESONATORS, AND GUITAR TONE

Resonators, EQ, and Tone

A guitar tone is a complex thing. Factors as diverse as the wood, size, and shape of a guitar can alter its tone. Strings, pickups, hardware, active electronics, and a myriad of other factors make up the distinctive and elusive intangible known as "tone". All of these factors, however, have one thing in common: they alter the harmonic structure of the guitar's sound. While the fundamental frequency of A above middle C is 440 Hz, the timbre of the note itself is made up of not only the fundamental frequency, but a series of overtones (harmonics) as well. When you play an A on one guitar, the note will have a unique sound. When you play an A on a different guitar, the note will have the same 440 Hz fundamental, but can have a completely different sound. This is due to the difference in overtones. This difference, which can be caused by all of the previously mentioned factors, means that every guitar setup has its own unique sound. Its own unique tone. The Quadraverb GT's EQ/Resonator section gives you specific control over fundamental and harmonic overtones in your guitar's tone. The parametric EQ gives you precise control of the fundamentals of your guitar tone by increasing or decreasing the amplitude of specific pitches over a variable bandwidth. By tuning the resonators and controlling their amplitude and delay resonance you can accentuate harmonics in your guitar tone. A resonator is a special filter whose response is so sharp that it actually imparts a pitch to any signal going through it.

Resonator Decay (Resonators + EQ mode only)
The display says: RESONATOR 1 DCY: 90 This sets the decay time for resonator 1. The higher the number, the longer the decay.
Resonator Amplitude (Resonators + EQ mode only)
The display says: RESONATOR 1 AMP: 99 This sets the volume level for resonator 1. The higher the number, the louder the output of the resonator. Please note that if both resonators are assigned a value of 00, you will not hear any sound in this configuration. Pressing the PAGE up button will show the Tune, Decay, and Amplitude pages for Resonator 2.
Low EQ Frequency (3 Band EQ mode only)
The display says: LOW EQ FREQUENCY 200Hz This sets the frequency below which all signals will be boosted or cut by the amplitude amount set on the next page.
Low EQ Amplitude (3 Band EQ mode only)
The display says: LOW EQ AMPLITUDE + 00.00dB This sets the amount of boost (positive numbers) or cut (negative numbers) at the Low EQ Frequency set on the previous page.

Mid EQ Frequency

The display says: MID EQ FREQUENCY 2000Hz The midrange filter is a parametric type. This parameter sets the midrange frequency at which signals will be boosted or cut.

Mid EQ Bandwidth

The display says: MID EQ BANDWIDTH 1.00 OCTAVES Bandwidth refers to the width (range of frequencies) of the band of frequencies that will be affected by the EQs boost and cut values. Example: A bandwidth of one octave boosts a wider range of frequencies than a bandwidth of 0.2 octaves.

Mid EQ Amplitude

The display says: MID EQ AMPLITUDE + 00.00dB This sets the amount of boost (positive numbers) or cut (negative numbers) at the Mid EQ Frequency set on the Mid EQ Frequency page.
High EQ Frequency (3 Band EQ mode only)
The display says: HIGH EQ FREQUENCY 08000Hz This sets the frequency above which all signals will be boosted or cut by the amplitude amount set on the next page.
High EQ Amplitude (3 Band EQ mode only)
The display says: HIGH EQ AMPLITUDE + 00.00dB This sets the amount of boost (positive numbers) or cut (negative numbers) at the High EQ Frequency set on the previous page.
4.9 EDITING LEZLIE EQ PARAMETERS (config 2)
Configurations 2s EQ has one page that adjusts the timbre of the rotating speaker sound.

High Rotor Level

The display says: HIGH ROTOR LEVEL + 00dB Rotating speakers generally have two different speaker drivers, one for high, and one for low frequencies. This parameter adjusts the level of the high frequency speaker from -20 dB lower than the low frequency speaker to +06 dB higher. More positive numbers increase the overall brightness of the sound.

Select MIDI Trigger Mode

1. Press the DELAY button. The lower display line shows either ONE SHOT or LOOPING: SAMPLE PLAYBACK: ONE SHOT 2. Press the PAGE UP button until the display reads: MIDI TRIGGER: GATED Use the VALUE buttons to select the desired mode: MIDI Gated The sample stops playing as soon as the key is released.
Off The QuadraVerb GT will not respond to MIDI note on/off information). MIDI One Shot The recorded sample will play back to the selected end of the sample, regardless of how long the key is pressed. IMPORTANT: If the playback mode is set to "Looping" and MIDI Trigger is set to One Shot, the sample will play indefinitely until the mode is changed or the sampling configuration is deselected. MIDI Trigger and Sample Playback mode need to be set to the same value (either both Looping or both One Shot.)
Select the MIDI Trigger Note
1. Assuming the DELAY module is selected, use the PAGE buttons to select the display that says: MIDI TRIGGER LOW LIMIT: 000 2. Press the VALUE UP button to select the lowest note that can trigger the recorded sample. (Note number 60 = Middle C.) 3. Press the PAGE UP button. The next display says: MIDI TRIGGER BASE: 060 4. The Base value is the note where the sample plays back with no pitch change. Press the VALUE buttons to select the desired note. 5. Press the PAGE UP button. The next display says: MIDI TRIGGER HIGH LIMIT: 060 6. Press the VALUE DOWN button to select the highest note that can trigger the recorded sample.
Because of the nature of sampling, the timing of the sample as well as the pitch will change the farther away from the base note from which it is transposed, with the higher notes sounding like munchkins and the lower notes like giants. This is a normal phenomena that occurs during sample playback. The pitch of the sample will follow within a 2 octave range and will loop back into the range if any note information falls outside of the 2 octave range. For instance, if the base note has been selected to note number 60 (Middle C or C3) and you play note number 84 (C5), the sample pitch will be triggered 1 octave higher than the bass (C4).
Adjusting the Sample Playback Length
In any playback mode it is possible to adjust the sample playback length to either ignore unwanted sampled material or dead air, or to make a loop more musical. To do this: 1. Assuming the DELAY module is selected, use the PAGE buttons to select the display that says: SAMPLE START: 0.00 SECONDS This page determines the point from which the sample plays back. 2. Use the VALUE buttons to select the desired Start time. The start can be anywhere in the sample in 10 millisecond steps. Moving the sample start maintains the loop length unless the sample end moves past the loop end point. In this case, the loop will end at the actual sample end regardless of the loop duration. However, the duration value will remain intact, and will retake effect if the loop start is moved forward enough to allow the complete loop length. 3. Use the PAGE buttons to select the display that says: SAMPLE LENGTH: 1.55 SECONDS

6.3 EDIT THE PROGRAM CHANGE TABLE
The display says: PROGRAM TABLE: 000 = 00 The lower left, three-digit number represents the incoming program change number. The lower right, two-digit number represents the QuadraVerb GT program that will be selected in response to the displayed program change number. In a new QuadraVerb GT, the two numbers should be equal up to MIDI program change number 100. At that point, the QuadraVerb GT program numbers start over again (i.e., 100=00, 101=01, 102=02, etc.). While this screen is showing, the PAGE UP button moves the cursor underneath the QuadraVerb GT program number. The PAGE DOWN button moves the cursor back under the MIDI program change number. The VALUE buttons change the selected parameter. To edit the program change table: 1. Select the incoming MIDI program change number with the VALUE buttons. 2. Press the PAGE UP button to move the cursor under the corresponding QuadraVerb GT program number. 3. Use the VALUE buttons to select the desired QuadraVerb GT program number. 4. To do more edits, press the PAGE DOWN button to return the cursor to the incoming MIDI program change parameter. 5. Repeat steps 1-4 until the table is completely edited.
6.4 MIDI THRU/OUT SELECTION
The display says: MIDI THRU OFF When OFF, the rear panel MIDI Out/Thru jack works as a MIDI Out jack that can transmit data generated by the QuadraVerb GT (see sections 5.5 and 5.6). When ON, the rear panel MIDI Out/Thru jack serves as a MIDI Thru jack that carries a duplicate of the data appearing at the QuadraVerb GTs MIDI In. Even when the MIDI Thru function is enabled, the MIDI Thru/Out jack will continue to function as a MIDI Out.
6.5 SYSTEM EXCLUSIVE DATA ENABLE
The display says: SYSEX ENABLE: ON When ON, the QuadraVerb GT can send and receive System Exclusive data over its MIDI Out jack. When OFF, the QuadraVerb GT will not be able to send or receive System Exclusive data.
6.6 SEND PROGRAM DATA (SYS EX) OVER MIDI
The display says: SEND MIDI PROG: 00 TO 00 The QuadraVerb GT can convert its patch data into a format compatible with the MIDI spec. This is a type of System Exclusive data, meaning that it is not defined as part of the general MIDI spec, but represents data that is only understood by gear that has been trained to receive information

8.4B Mode Messages

There are two messages that determine the MIDI mode (i.e., how the QuadraVerb GT will receive MIDI data). The "omni" message determines how many channels will be recognized. Omni On means that data from all channels will be received; Omni Off limits the number
of channels, usually to one. The "mono/poly" message deals with voice assignment within the synthesizer. In Mono mode, only one note at a time plays in response to voice messages; in Poly mode, as many voices can play notes as are available to play notes. The QuadraVerb GT implements two different MIDI modes. Omni On/Poly (Mode 1) The QuadraVerb GT responds to MIDI data occurring on any channel. Omni Off/Poly (Mode 3) The QuadraVerb GT is tuned to a single MIDI channel, from 1 to 16.
8.5 SYSTEM COMMON MESSAGES
Intended for all units in a system, some of these messages are: Song Position Pointer This indicates how many "MIDI beats" (normally a 16th note) have elapsed since a piece started (up to 16,384 total beats). It is primarily used to allow different sequencers and drum machines to auto-locate to each other so that if you start one sequencer, the other device will automatically jump to the same place in the song, whereupon both continue on together. System Exclusive This message (called sys ex for short) is considered "exclusive" because different manufacturers send and receive data over MIDI which is intended only for that manufacturer's equipment. Example: Sending an QuadraVerb GT message to an Ensoniq SD-1 won't do anything but the message will be understood by other QuadraVerb GT. This data often contains information about individual instrument programs. Timing Clock A master tempo source (such as a sequencer) emits 24 timing messages (clocks) per quarter note. Each device synchronized to the sequencer advances by 1/24th of a quarter note when it receives the clock message, thus keeping units in sync after they've both started at the same time. Many devices subdivide this clock signal internally for higher resolution (e.g., 96 pulses per quarter note). Start Signals all rhythmically-based units when to start playing.