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Roland GP-8

 

 

 

roland g8 effect rack

info Country: Japan
Weight: 4 Kg
Dimensions: 482 (w) x 282 (h) x 44 (d) mm
audio demo trend price : 100€
manual schematic demo   comments

Roland GP-8
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.

logo gp8
logo

info 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:
- signal input
- stereo out
- line out
- Midi interface
- 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.

 

 


edit 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.


cpu

 

edit 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.

gp8 tech



wavesEFFECTS
unit offers 8 effects that can be chained, partially edited or muted: overdrive, distortion, compressor, dynamic filter, phaser, parametric EQ, digital delay and Chorus

 

gp8


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


ir309 roland

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.

 


memroy MIDI only 2 Midi CC# control changes are available: numbers CC80 & CC16 for expression purposes, same functions as Ev-5 pedal.



clock
TECH: GP8 System handles Midi exclusives.


 


memroy MEMORY
:
- 128 RAM performances
- NO ROM factory recall (download recover file)


demo
Battery replacement: a kind of CR1 3V (if my memory is right) soldered to the mainboard. - Click for bigger motherboard pic -




edit 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

 

gp8 editor atari st


 

demoAUDIO DEMO

demo guitar: liquid sky
demo guitar: smooth
demo guitar: liquid 2
demo guitar: some distortions
demo guitar: chorused
demo guitar: delay parameters
demo guitar: long delay
demo guitar: chorused quick
demo guitar: wah distortion
demo bass: fuzzed
demo synth: getting fat
demo synth: filter pattern
demo synth: minimoog filtered
demo synth: resonance sweep
demo synth: commodore sid sweep
demo synth: bassliner distortion
demo synth: funked wah
demo test: sinewave
demo Drum: processed loop
demo Drum: another processed loop


 

video VIDEO SELECTION

guitar demo guitar and roland gp8 Roland gp8 sounds
guitar demo again guitar various sounds


 

demo

 

Company: Roland
Model: GP-8
Class: Rackmount effect
Dates: 1987
Price: 100€
Technology: hybrid
Freq. response: 40 -12 kHz
Number of FX: 8
Delay time: 1 second
Delay resolution: 12 bits
Equalizer: 3 bands
Memory: 128 slots
CPU: MC6803
Demo: 2
0

 

thumb


manual
MANUAL


manual
SERVICE MANUAL


manual
DOWNLOAD FACTORY PATCHES

rx5 reset procedure
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.


manual
-OS EPROM DUMP
-MORE DEMO

 

gp8 banner

roland gp8
demo original brochure



roland gp8

demodemo cat gp8

ROLAND GP-8 for SALE

gp8 editor atari st
CHECK OUT EBAY OFFERS

 

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gp8 assy boss mark motherboard
awardSPECIAL AWARDS:

solid

solid
CHEAP as HELL weird hybrid

comment

REVIEW" Vintage sounding enclosed in a single rack unit: how much would you pay for EACH classic Boss stompbox?"

manual manual
- chorus - no reverb
-cheap
- limited edit



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Roland gp8 3.5 out of 5 based on 40 ratings. price €150