KORG volca fm: MIDI CC, NRPN and OSC map¶
The KORG volca fm as named OSC addresses — 30 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | KORG volca fm |
|---|---|
| Vendor | KORG |
| OSC prefix | /volca_fm |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per pencilresearch canonical CSV |
| Upstream | electra-preset |
| Driver file | devices/korg/volca_fm.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_fm.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_fm: ask “what can the KORG volca fm do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (30)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/volca_fm/general/transpose |
40 | 0–127 | continuous | General | |
/volca_fm/general/velocity |
41 | 0–127 | continuous | General | |
/volca_fm/general/modulator_attack |
42 | 0–127 | continuous | General | |
/volca_fm/general/modulator_decay |
43 | 0–127 | continuous | General | |
/volca_fm/general/carrier_attack |
44 | 0–127 | continuous | General | |
/volca_fm/general/carrier_decay |
45 | 0–127 | continuous | General | |
/volca_fm/general/lfo_rate |
46 | 0–127 | continuous | General | |
/volca_fm/general/lfo_pitch_depth |
47 | 0–127 | continuous | General | |
/volca_fm/general/algorithm |
48 | 0–127 | continuous | General | |
/volca_fm/general/arpeggiator_type |
48 | 0–127 | continuous | General | |
/volca_fm/general/arpeggiator_div |
50 | 0–127 | continuous | General | |
/volca_fm/transpose |
40 | 0–127 | continuous | ||
/volca_fm/attack |
42 | -63–63 | continuous | ||
/volca_fm/attack |
44 | -63–63 | continuous | ||
/volca_fm/rate |
46 | 0–99 | continuous | ||
/volca_fm/type |
49 | 0–127 | continuous | ||
/volca_fm/velocitty |
41 | 1–127 | continuous | ||
/volca_fm/decay |
43 | -63–63 | continuous | ||
/volca_fm/decay |
45 | -63–63 | continuous | ||
/volca_fm/pitch_depth |
47 | 0–99 | continuous | ||
/volca_fm/algorithm |
48 | 0–127 | continuous | ||
/volca_fm/divider |
50 | 0–127 | continuous | ||
/volca_fm/patches |
88 | 0–127 | continuous | ||
/volca_fm/chorus |
85 | 0–127 | continuous | ||
/volca_fm/stereo_width |
86 | 0–127 | continuous | ||
/volca_fm/speed |
87 | 0–127 | continuous | ||
/volca_fm/tempo_divider |
90 | 0–127 | continuous | ||
/volca_fm/patterns |
89 | 0–127 | continuous | ||
/volca_fm/wheel |
1 | 0–127 | continuous | ||
/volca_fm/assignation |
91 | 0–127 | continuous |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /volca_fm/note/on <note> <velocity>, /volca_fm/cc/<number> <value>, /volca_fm/pitchbend <0-16383>, /volca_fm/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.