The Roland GP-100 Guitar P reamp/Processor was the first rack mount effects processor to use Composite Object Sound Modeling (COSM).
This new technology allows the GP-100 to accurately reproduce classic guitar amps, a large selection of speaker cabinets and several different microphones.

Dedicated knobs are provided to allow you to easily change the preamp settings of the GP-100. The GP-100 can produce up to 16 effects simultaneously which can be arranged in any order.

These include a wide variety of effects like ducking delay, tap delay, noise suppressor, phaser, reverb, slow gear, tremolo/pan, chorus, compressor /limiter, equalizer and intelligent pitch shifting.

The 200 Preset and 200 User Patches include 16 realtime controllers, selectable stereo outputs, two programmable effects loops and two external control switches. The system can be set up with a guitar amp or direct to the board for recording. The GP-100 also includes a built in chromatic guitar tuner.

• Initializing the GP-100

1) Hold the PARAMETER knob while powering on.
2) Press WRITE.

• Connecting the GP-100 to a Sound System

Both pair of stereo outputs can be individually setup to work with a standard guitar amp or direct into a full range PA or recording system. The factory presets are setup to use the OUTPUT A L(MONO) and R connections. Connect a set of cables from these outputs.
1) Press GLOBAL.
2) Rotate PARAMETER to Amp Being Used-.A.
3) Rotate VALUE to select Solid State or Tube to determine the amplifier you are using.
4) Dial PARAMETER to SP(eakers) Being Used:A. VALUE to the appropriate cabinet type - Built In for combo amps or stack for separated.
5) Dial PARAMETER to SP(eaker) Color-.A. Dial VALUE to Adjust for guitar amp.
6) Press EXIT to return to play mode.

• Tuning the Guitar

1) Connect a guitar to the INPUT on the front panel.
2) Press the TUNER button and play each string.
3) Adjust the tuning of each string to the center position of the meter.
4) Press EXIT to return to play mode.

• Auditioning Patches

The GP-100 has 200 user programmable (001 to 200) and 200 preset patches (201 to 400). To scroll through patches one at a time, rotate the NUMBER knob. Pressing the NUMBER knob in while rotating it will change patches in increments of 10. Check out the following patches:

1) 001 CLASSIC STACK - 1959 Marshal stack with realistic dynamic control.
2) 002 JC-120 Clean - Original sound of the Roland JC-120 Jazz Chorus amplifier.
3) 007 5VOICE HARMONY - Thick harmony in the key of C.
4) 011 BOOGIE LEAD -Mesa Boogie Lead channel with stack.
5) 012 VINTAGE TWIN - Classic Fender Twin with 2 x 12" speakers.

• Editing Sounds

The PREAMP knobs are similar to knobs on a standard guitar amplifier. Rotate the knob past the original value so that it catches the number, then continue to rotate to change the value of the selected parameter.

1) Select any patch as a starting point.
2) Rotate the PARAMETER knob. The effects will be abbreviated with two letters.
3) Press the VALUE knob to turn effects ON or OFF. Rotate VALUE to change the placement of the selected effect in the chain. (The DUAL algorithm can not reorder the effects).
4) Continue rotating PARAMETER to access the parameters of each effect. Press and rotate PARAMETER to skip through each effect quickly.
5) Rotate VALUE to change effects settings. Press and rotate VALUE knob to change values quickly.

• Writing a Patch

Once you have edited a sound you can write it to any of the 200 user programmable memory locations.

1) Press WRITE. The number of the PATCH will flash.
2) Use the VALUE dial to select the location in which you want to store your Patch.
3) Press WRITE again.