KEYBOARD 61 velocity keys, standard pitchbender + modulation,
main display features a 16 X 2 Lines LCD display, 58 push buttons and 5 sliders: edit palette function 1 / 2 / 3- main volume- data entry.
JV-80: (1992) 28 voices - 61 keys - first of the series, more or less the Jv30 synthesizer version.
JV-35: (1993) 28 voices updated JV-30 with bigger memory and some extra features.
JV-50: (1994) 61 keys, 28 voices. Same as JV 35 with sequencer and floppy drive.
JV-90: (1994) 76 keys - 28 voices - updated JV-80 synth series.
JV-1000: (1994) 76 keys a 28 voices workstation with sequencer. Last JV keyboard series, then replaced by XP series.
1- Midi interface
2 - pedal hold input
4- main signal out
5- Power supply external PSU with negative center +(- 800 mA.
SOUND main (mask) CPU H8/532 part of manages up to 24 voices polyphony with a 16 bits DAC UPD6376GS.
A JV-30 tone is composed by one or various PCM multisample - internal samples cannot be really edited just like previous classic digital model Roland U-20. Internal ROM (3 X IC) wavetable features 445 tones (317 GS + 128 drums) or samples at 16 bits resolution mainly derived from classic Roland Canvas SC-55. Each tone offers 8 variations presets ready to go, easily accessible from panel. JV sounds are organized in instruments families (eg: brass, piano, orchestral) mostly bread and butter sounds
PERFORMANCE system manages up to 16 parts each and some parameters:
- volume mix + effects send
- fat mode: stacks 2 voices and adds a panning position
- otave add 1 octave lower layer
- dual: 2 different tones on a layer
- split defines 2 zones for split play
- solo mode (monophonic)
- transpose: up to 12 tones
- panning position
FILTER classic resonant filter with single cutoff parameter.
LFO a simple delayed vibrato modulation with 2 parameters: + adjustable frequency rate + depth amount
FILTER typical arturia braned "Steiner Parker" LPF and HPF with resonance. It can be bypassed.
EFFECTS DSP offers 2 engines A-B:
- ENGINE A: 8 chorus models: classic, flanging and short delay
- ENGINE B: 8 reverb models: hall, plate, delay and room.
MIDI good implementation for its time: exclusives systems that can access to all in-deep edit parameters.
MEMORY: 8 performances + 128 ROM preset tones + 128 RAM slots + 9 ROM + 9 RAM drum kits.; sounds can be saved by Midi sysex
Battery replacement: CR-2032 in battery holder.
->JV30 FACTORY RESET: PRESS CHORUS + REVERB (ABOVE INIT) TOGETHER THEN PRESS VALUE UP
JV30 MAINTENANCE AND REPAIR typical issues are:
- old tact switches for the buttons, replacement is quite easy but involves soldering
- Display flickering, try to search for cold solder joint.