KORG volca bass: MIDI CC, NRPN and OSC map¶
The KORG volca bass as named OSC addresses — 12 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | KORG volca bass |
|---|---|
| Vendor | KORG |
| OSC prefix | /volca_bass |
| 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_bass.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_bass.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_bass: ask “what can the KORG volca bass do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (12)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/volca_bass/general/slide_time |
5 | 0–127 | continuous | General | |
/volca_bass/general/expression |
11 | 0–127 | continuous | General | |
/volca_bass/general/octave |
40 | 0–127 | continuous | General | |
/volca_bass/general/lfo_rate |
41 | 0–127 | continuous | General | |
/volca_bass/general/lfo_intensity |
42 | 0–127 | continuous | General | |
/volca_bass/general/vco_pitch_1 |
43 | 0–127 | continuous | General | |
/volca_bass/general/vco_pitch_2 |
44 | 0–127 | continuous | General | |
/volca_bass/general/vco_pitch_3 |
45 | 0–127 | continuous | General | |
/volca_bass/general/eg_attack |
46 | 0–127 | continuous | General | |
/volca_bass/general/eg_decay_release |
47 | 0–127 | continuous | General | |
/volca_bass/general/cutoff_eg_intensity |
48 | 0–127 | continuous | General | |
/volca_bass/general/gate_time |
49 | 0–127 | continuous | General |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /volca_bass/note/on <note> <velocity>, /volca_bass/cc/<number> <value>, /volca_bass/pitchbend <0-16383>, /volca_bass/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.