By default, the D-50 is in poly mode; that is, the two available tones respond to one MIDI channel each. As various Roland MIDI guitar synthesizers transmit on multiple MIDI channels, the D-50 must be switched to mono mode.
This is accomplished only via an external MIDI device.
- Send a Control Change 126 message (value of 127) to switch the D-50 to Mono mode.
- When finished, send a Control Change 127 message (value of 127) to switch the D-50 back to Poly mode.