devices/roland/mc_707_groovebox.jsonEdit on GitHubJSONRoland MC-707 MIDI CC chart, NRPN and OSC map
The Roland MC-707 MIDI implementation: 25 CC, each named, for Claude (MCP), SuperCollider or any OSC app.
- sourceMIDI Guide
- licenceCC-BY-SA-4.0
- real unitnot yet checked
Not checked on a real Roland MC-707 yet. Own one? Load a sound or send a control, and tell us whether it worked.
- Maker
- Roland
- Version
- per pencilresearch canonical CSV
- Source
- MIDI Guide
- Data licence
- CC-BY-SA-4.0 MIDI Guide (https://midi.guide) by Pencil Research and contributors
- OSC prefix
/mc_707_groovebox
Use it
Find the MIDI ports, then start the bridge with this driver:
osc-bridge detect # prints the ready-to-run line for what is plugged in
osc-bridge run --device devices/roland/mc_707_groovebox.json --out-port <N> --in-port <M>
Then send OSC to 127.0.0.1:7777, for example:
From Claude or any MCP client, the osc-bridge mcp server exposes this driver as mc_707_groovebox: ask “what can the Roland MC-707 do?” and it reads this map with list_routes. See the MCP guide.
MIDI controls
25 controls, each with its number, its range and the name to send
Envelope
| Control | CC | Range | Name to send |
|---|---|---|---|
| Attack time | 73 | 0–127 | /mc_707_groovebox/envelope/attack_time |
| Decay time | 75 | 0–127 | /mc_707_groovebox/envelope/decay_time |
| Release time | 72 | 0–127 | /mc_707_groovebox/envelope/release_time |
Filter
| Control | CC | Range | Name to send |
|---|---|---|---|
| Cutoff | 74 | 0–127 | /mc_707_groovebox/filter/cutoff |
| Resonance | 71 | 0–127 | /mc_707_groovebox/filter/resonance |
Knobs
| Control | CC | Range | Name to send |
|---|---|---|---|
| Filter knob | 80 | 0–127 | /mc_707_groovebox/knobs/filter_knob |
| Mod knob | 81 | 0–127 | /mc_707_groovebox/knobs/mod_knob |
| Fx knob | 82 | 0–127 | /mc_707_groovebox/knobs/fx_knob |
| Sound knob | 83 | 0–127 | /mc_707_groovebox/knobs/sound_knob |
Effects
| Control | CC | Range | Name to send |
|---|---|---|---|
| Reverb send level | 91 | 0–127 | /mc_707_groovebox/effects/reverb_send_level |
| Chorus send level | 92 | 0–127 | /mc_707_groovebox/effects/chorus_send_level |
General
| Control | CC | Range | Name to send |
|---|---|---|---|
| Modulation | 1 | 0–127 | /mc_707_groovebox/general/modulation |
| Portamento time | 5 | 0–127 | /mc_707_groovebox/general/portamento_time |
| Volume | 7 | 0–127 | /mc_707_groovebox/general/volume |
| Panpot | 10 | 0–127 | /mc_707_groovebox/general/panpot |
| Expression | 11 | 0–127 | /mc_707_groovebox/general/expression |
| Hold 1 | 64 | 0–127 | /mc_707_groovebox/general/hold_1 |
| Portamento | 65 | 0–127 | /mc_707_groovebox/general/portamento |
| Sostenuto | 66 | 0–127 | /mc_707_groovebox/general/sostenuto |
| Soft | 67 | 0–127 | /mc_707_groovebox/general/soft |
| Legato foot switch | 68 | 0–127 | /mc_707_groovebox/general/legato_foot_switch |
| Portamento control | 84 | 0–127 | /mc_707_groovebox/general/portamento_control |
Vibrato
| Control | CC | Range | Name to send |
|---|---|---|---|
| Rate | 76 | 0–127 | /mc_707_groovebox/vibrato/rate |
| Depth | 77 | 0–127 | /mc_707_groovebox/vibrato/depth |
| Delay | 78 | 0–127 | /mc_707_groovebox/vibrato/delay |
Performance MIDI
Notes, pitch bend and any CC are also available: /mc_707_groovebox/note/on <note> <velocity>, /mc_707_groovebox/cc/<number> <value>, /mc_707_groovebox/pitchbend <0-16383>, /mc_707_groovebox/program_change <n>.
Limitations
CC/NRPN only. SysEx (preset management, display control, bulk dump/load, vendor-proprietary opcodes) is NOT covered by pencilresearch. To extend this device with SysEx, sniff the vendor editor, add `sysex.header/footer` + `commands` blocks, and use `update_device.md` PR template.
Frequently asked questions
Which MIDI CC controls the filter cutoff on the Roland MC-707?
CC 74 (0–127), named /mc_707_groovebox/filter/cutoff in SynthHub's map.
How many parameters of the Roland MC-707 can be controlled over MIDI?
SynthHub's map of the Roland MC-707 lists 25 MIDI CC parameters, each with its number, range and a readable name; the full chart is on this page.
Can an AI agent like Claude control the Roland MC-707?
Yes: SynthHub's hosted MCP server knows the Roland MC-707's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.