When using a MIDI keyboard with a computer based sequencing program Local Control should be turned off to prevent doubling of notes. Use the following procedure to turn Local Control on or off in the JV-30.
- Press the [MASTER] button located on the left side of the [WRITE] button to light it up.
- Press the [MIDI] button and use the PARAMETER buttons to select "Local."
- Use the VALUE buttons to select "ON" or "OFF."
Owner's Manual: https://www.roland.com/us/support/manual_archive/