Teenage Engineering OP-1 field MIDI

Quick reference

Synth slots

Program Change 0–7 selects slots 1–8

Manufacturer documented

MIDI reference: Program Change

Drum slots

Program Change 8–15 selects slots 1–8

Manufacturer documented

MIDI reference: Program Change

Tape mute

CC 9, channels 1–4; values ≥64 mute

Manufacturer documented

MIDI reference: CC 9

Tape transport

Start/Continue play; Stop stops

Manufacturer documented

MIDI reference: realtime messages

Sound slots and mode

Program Change values 0–7 select synth slots 1–8; values 8–15 select drum slots 1–8. Some senders display program numbers starting at 1, so check the actual transmitted value.

CC 93 selects synth mode for values below 64 and drum mode for values 64 or above. Check mode and slot selection when an automation track changes the instrument unexpectedly.

Tape tracks and transport

CC 7 controls track volume, CC 9 track mute and CC 10 pan. MIDI channels 1–4 address tape tracks 1–4. For CC 9, values of 64 or above mute the addressed track.

MIDI Start and Continue play the tape; Stop stops it. The 1.7.0 release notes describe expanded MIDI controls, so older firmware may not have the same behavior.