When you are using a MIDI keyboard with a computer based sequencing program, turning the keyboard's Local Control off will prevent doubling of the sounds triggered by the sequencer.
Use the following procedure to turn Local Control on or off in the JV-80/90/1000:
- From Performance or Patch Play mode, press the MIDI button.
- Use the CURSOR buttons to select "Local" and the INC/DEC buttons to select
"ON" or "OFF" as desired.
Owner's Manual: https://www.roland.com/us/support/manual_archive/