You may have a MIDI loop / echo (where MIDI message being sent out of the synth are being sent back in). Confirm if this is the case by disconnecting one of the MIDI connectors or setting the MIDI-in Filters to 'Off'.
You may have a MIDI loop / echo (where MIDI message being sent out of the synth are being sent back in). Confirm if this is the case by disconnecting one of the MIDI connectors or setting the MIDI-in Filters to 'Off'.