MIDIROCK.XYZ
Teenage Engineering / Synthesizer and tape workstation

Teenage Engineering OP-1 field

Select sound slots and control tape tracks using the field’s documented MIDI messages.

Manufacturer documented OP-1 field, with MIDI behavior documented in guide 1.7.0. These controls are not an original OP-1 reference; check installed firmware before using newer messages.
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Reference

Look up MIDI

Check MIDI settings and supported messages.

Troubleshoot

Fix a problem

Start with the fastest documented checks.

Workflow

Connect gear

Find wiring guides and see which setups still need testing.

At a glance

MIDI quick reference

Synth slots
Program Change 0–7 selects slots 1–8
Manufacturer documented
Drum slots
Program Change 8–15 selects slots 1–8
Manufacturer documented
Tape mute
CC 9, channels 1–4; values ≥64 mute
Manufacturer documented
Tape transport
Start/Continue play; Stop stops
Manufacturer documented
Full MIDI reference
Answer first

Common problems

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.
Official resources

Manuals & resources

OP-1 field guide — MIDI reference

Teenage Engineering · Online guide 1.7.0, MIDI reference · last checked 2026-10-03

OP-1 field firmware downloads and release notes

Teenage Engineering · 1.7.0 release notes, 29 April 2026 · last checked 2026-10-03

References

Sources & review

Sources reviewed: . Documentation does not replace a physical hardware test.

Sections reviewed: MIDI reference: Program Change; MIDI reference: CC 9; MIDI reference: realtime messages; Guide 1.7.0: MIDI reference, Program Change and CC 93; Guide 1.7.0: MIDI reference; firmware 1.7.0 release notes.