MIDIROCK.XYZ
Troubleshooting

Teenage Engineering OP-1 field fixes

Choose your symptom and work through the checks. Each guide includes its sources and any testing limits.

Manufacturer documented
OP-1 field selects the wrong sound slot over MIDI
A program selection loads a drum slot or an adjacent synth slot.Manufacturer documented
OP-1 field tape track mutes during MIDI playback
A tape track becomes silent when a MIDI automation track runs.