KORG volca keys: MIDI CC, NRPN and OSC map¶
The KORG volca keys as named OSC addresses — 16 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | KORG volca keys |
|---|---|
| Vendor | KORG |
| OSC prefix | /volca_keys |
| Source | 📦 Derived from MIDI Guide (community CC/NRPN data) |
| Firmware | unknown |
| Revision | per pencilresearch canonical CSV |
| Upstream | pencilresearch |
| Data licence | CC-BY-SA-4.0 — MIDI Guide (https://midi.guide) by Pencil Research and contributors |
| Driver file | devices/korg/volca_keys.json |
Not tested on the device yet
This driver comes from documentation or community data and has not been checked on real hardware. If you own one, a quick test and a pull request promoting it helps everyone — see CONTRIBUTING.
How do you control 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/korg/volca_keys.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 volca_keys: ask “what can the KORG volca keys do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (16)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/volca_keys/vco/portamento |
5 | 0–127 | continuous | VCO | |
/volca_keys/general/expression |
11 | 0–127 | continuous | General | |
/volca_keys/general/voice |
40 | 0–127 | continuous | General | |
/volca_keys/general/octave |
41 | 0–127 | continuous | General | |
/volca_keys/vco/detune |
42 | 0–127 | continuous | VCO | |
/volca_keys/vco/eg_depth |
43 | 0–127 | continuous | VCO | |
/volca_keys/eg/attack |
49 | 0–127 | continuous | EG | |
/volca_keys/eg/decay_release |
50 | 0–127 | continuous | EG | |
/volca_keys/eg/sustain |
51 | 0–127 | continuous | EG | |
/volca_keys/vcf/cutoff |
44 | 0–127 | continuous | VCF | |
/volca_keys/vcf/eg_intensity |
45 | 0–127 | continuous | VCF | |
/volca_keys/lfo/rate |
46 | 0–127 | continuous | LFO | |
/volca_keys/lfo/pitch_intensity |
47 | 0–127 | continuous | LFO | |
/volca_keys/lfo/cutoff_intensity |
48 | 0–127 | continuous | LFO | |
/volca_keys/delay/time |
52 | 0–127 | continuous | Delay | |
/volca_keys/delay/feedback |
53 | 0–127 | continuous | Delay |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /volca_keys/note/on <note> <velocity>, /volca_keys/cc/<number> <value>, /volca_keys/pitchbend <0-16383>, /volca_keys/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.