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Roland | GR-77B
|In 1986 Roland introduced the GR-77B Bass Guitar Synthesizer. Similar in style and function as the GR-700 guitar synthesizer, the GR-77B is a 4 voice pedal hybrid synthesizer unit based on the Roland JX-8P sound engine and has 4 processors. One for each string to facilitate fast tracking. The instrument also has two 4 stage envelope generators and cross modulation between oscillators, frequency modulation with envelope and/or modulation.
Additionally the GR-77B has a low pass filter with LFO, envelope and pitch modulation as well as a variable high pass filter. There is also an additional LFO for vibrato effects.The 11 built in foot switches can be used for programming the synthesizer or deeper program editing can be achieved using the optional PG-800 programmer. Moreover the GR-77B also features a MIDI out for control other synthesizers and equipment
The GR-77B also has it's own bass guitar controller. The G-77 which features the same design and functionality as the G-707 guitar controllers. Similar in shape like the G-707 the G-77 controller has a stabilizer bar running across the entire body and neck to add more stability for tracking of notes across the fretboard.
The unit also has a lush analog chorus mode and features delectable pitch bend, hold and voices can be individually turned off for each string. Finally the GR-77 controller also functions as a traditional bass guitar and can be played by itself or combined with the GR-77B synthesizer.
|Engine Detailed||2 DCO's Square, Sawtooth or Pulse Waveform|
|Filter (VCF)||Resonant Low pass|
|Envelope (VCA)||ADSR x2|
|Memory||32 preset, 32 user, 64 on memory card|
|CV-gate||Roland 24-pin interface from G-77|
|Extra info||Programmable via PG-800|
|Produced:||1984 - 1986|
|Legend:||Obvious||Y: Yes, N: No, N/A: Not Applicable|
|VCO||Voltage Controlled Oscillator||DCO||Digital Controlled Oscillator|
|LFO||Low Frequency Oscillator||Sub||Sub Oscillator|
|VCF||Voltage Controlled Filter||VCA||Voltage Controlled Amplifier|
|Velocity||As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key.||Aftertouch||Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.|
|Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.|