| Country: Japan
Weight: 4 Kg
Dimensions: 482 (w) x 282 (h) x 44 (d) mm
| trend price : 100€
Guitar Effects Processor (1987)
The GP-8 is a analog-digital hybrid multi-effect rackmount unit.
GP signal Processor a big Roland-Boss commercial success and many units sold around the world.
RACKMOUNT 1 rack unit.
Main panel features a numeric orange 16 X 2 lines display, 16 buttons and an alpha-data dial for values entries.
Back panel terminal connectors:
- stereo out
- line out
- send/ return
custom RCC input for pedal board FC-100 and optional EV-5 expression pedal. Tip: Midi and RCC as cannot be used at the same time.
TECH the main control is a 8-bits HD6303RF CPU (part of Motorola MC6803) and the internal circuit design is based on several hybrid digital / analog technologies.
The internal frequency sample response is from 40 to 12 kHz.
INTERFACE EDIT total lack of real-time knobs and many sub-menus. The interface is not very intuitive but worst of all, all effect edits are limited to a bunch of main parameters, no deep edit is possible.
EFFECTS unit offers 8 effects that can be chained, partially edited or muted: overdrive, distortion, compressor, dynamic filter, phaser, parametric EQ, digital delay and Chorus
Overdrive: simulates saturation, it should be a Turbo Overdrive equivalent.
parameters: tone / distortion / turbo boost.
Distortion: more a DS-1 rather than a SD-1
parameters: tone / distortion.
Compressor: long sustain by cutting higher input and boosting lower input compression range from to -35dB.
parameters: attack / sustain.
Dynamic filter: changes the filter cutoff frequency and produces a WAH effect similar to the T-Wah stompbox. Section is based on the famous Roland IC IR3109.
parameters: sensibility/ cutoff / resonance / cutoff
famous IC ir309 Roland
Phaser: a bit like out-of-control but the cold metallic feeling is interesting.
parameters: rate / depth / resonance.
Equalizer: a simple 3 -bands EQ, precious ina final chain effects.
parameters: HI / LOW / MID / LEVEL EQ.
Digital delay: up to 1000 ms time, 12 bits sampling resolution but system lacks a stereo panning effects.
parameters: wet/ delay time/ feedback.
Chorus: very good, best fx of the unit
parameters: rate/ depth/ wet / pre-delay / feedback.
MIDI only 2 Midi CC# control changes are available: numbers CC80 & CC16 for expression purposes, same functions as Ev-5 pedal.
GP8 System handles Midi exclusives.
- 128 RAM performances
- NO ROM factory recall (download recover file)
Battery replacement: a kind of CR1 3V (if my memory is right) soldered to the mainboard. - Click for bigger motherboard pic -
EDIT just basic parameter can be altered, no in-depth edit is really possible.
There are 2 editors available:
- Midquest (commercial MAC/PC)
- GP8 editor (free Atari ST) LINK
Roland GP-8 FACTORY RESET
No internal ROM recall, you have to reload the factory files by Midi- download this file in the "FACTORY PATCHES" below.
all snapshots, sounds, texts copyright Polynominal.com / Eric Pochesci
polynominal.com is not associated or affiliated with ROLAND in any manner.
Roland gp8 based on 40 ratings.