KORG Volca FM Dexed: MIDI CC, NRPN and OSC map¶
The KORG Volca FM Dexed as named OSC addresses — 19 CC, 41 SysEx commands — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | KORG Volca FM Dexed |
|---|---|
| Vendor | KORG |
| OSC prefix | /volca_fm_dexed |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per Electra preset |
| Upstream | electra-preset |
| Driver file | devices/korg/volca_fm_dexed.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_dexed.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_dexed: ask “what can the KORG Volca FM Dexed do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (19)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/volca_fm_dexed/transpose |
40 | 0–127 | continuous | ||
/volca_fm_dexed/attack |
42 | -63–63 | continuous | ||
/volca_fm_dexed/attack |
44 | -63–63 | continuous | ||
/volca_fm_dexed/rate |
46 | 0–99 | continuous | ||
/volca_fm_dexed/type |
49 | 0–127 | continuous | ||
/volca_fm_dexed/velocitty |
41 | 1–127 | continuous | ||
/volca_fm_dexed/decay |
43 | -63–63 | continuous | ||
/volca_fm_dexed/decay |
45 | -63–63 | continuous | ||
/volca_fm_dexed/pitch_depth |
47 | 0–99 | continuous | ||
/volca_fm_dexed/algorithm |
48 | 0–127 | continuous | ||
/volca_fm_dexed/divider |
50 | 0–127 | continuous | ||
/volca_fm_dexed/patches |
88 | 0–127 | continuous | ||
/volca_fm_dexed/chorus |
85 | 0–127 | continuous | ||
/volca_fm_dexed/stereo_width |
86 | 0–127 | continuous | ||
/volca_fm_dexed/speed |
87 | 0–127 | continuous | ||
/volca_fm_dexed/tempo_divider |
90 | 0–127 | continuous | ||
/volca_fm_dexed/patterns |
89 | 0–127 | continuous | ||
/volca_fm_dexed/wheel |
1 | 0–127 | continuous | ||
/volca_fm_dexed/assignation |
91 | 0–127 | continuous |
SysEx commands (41)¶
| OSC address | Arguments |
|---|---|
/volca_fm_dexed/envelope |
val: u7 |
/volca_fm_dexed/freq_coarse |
val: u7 |
/volca_fm_dexed/freq_fine |
val: u7 |
/volca_fm_dexed/detune |
val: u7 |
/volca_fm_dexed/mode |
val: u7 |
/volca_fm_dexed/operator_1 |
val: u7 |
/volca_fm_dexed/key_left_depth |
val: u7 |
/volca_fm_dexed/break_point |
val: u7 |
/volca_fm_dexed/key_right_depth |
val: u7 |
/volca_fm_dexed/key_left_curve |
val: u7 |
/volca_fm_dexed/key_rate_scaling |
val: u7 |
/volca_fm_dexed/key_right_curve |
val: u7 |
/volca_fm_dexed/operator_2 |
val: u7 |
/volca_fm_dexed/operator_3 |
val: u7 |
/volca_fm_dexed/operator_4 |
val: u7 |
/volca_fm_dexed/operator_5 |
val: u7 |
/volca_fm_dexed/operator_6 |
val: u7 |
/volca_fm_dexed/output_level |
val: u7 |
/volca_fm_dexed/amp_mod_sens |
val: u7 |
/volca_fm_dexed/key_vel_sen |
val: u7 |
/volca_fm_dexed/key_vel_sens |
val: u7 |
/volca_fm_dexed/range |
val: u7 |
/volca_fm_dexed/step |
val: u7 |
/volca_fm_dexed/time |
val: u7 |
/volca_fm_dexed/glissando |
val: u7 |
/volca_fm_dexed/master |
val: u7 |
/volca_fm_dexed/pitch |
val: u7 |
/volca_fm_dexed/amplitude |
val: u7 |
/volca_fm_dexed/eg_bias |
val: u7 |
/volca_fm_dexed/pitch_env |
val: u7 |
/volca_fm_dexed/mod_sensitivity |
val: u7 |
/volca_fm_dexed/waveform |
val: u7 |
/volca_fm_dexed/rate |
val: u7 |
/volca_fm_dexed/amp_depth |
val: u7 |
/volca_fm_dexed/pitch_depth |
val: u7 |
/volca_fm_dexed/delay |
val: u7 |
/volca_fm_dexed/synchronize |
val: u7 |
/volca_fm_dexed/algorithm |
val: u7 |
/volca_fm_dexed/feedback |
val: u7 |
/volca_fm_dexed/osc_key_sync |
val: u7 |
/volca_fm_dexed/transpose |
val: u7 |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /volca_fm_dexed/note/on <note> <velocity>, /volca_fm_dexed/cc/<number> <value>, /volca_fm_dexed/pitchbend <0-16383>, /volca_fm_dexed/program_change <n>.
Limitations¶
Imported from an Electra One community preset. The mapping reflects the preset author's editorial choices: parameter naming, ranges, and which params are exposed. Untested on hardware in this repo.