KORG MS-20: MIDI CC, NRPN and OSC map¶
The KORG MS-20 as named OSC addresses — 44 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | KORG MS-20 |
|---|---|
| Vendor | KORG |
| OSC prefix | /ms_20 |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per Electra preset |
| Upstream | electra-preset |
| Driver file | devices/korg/ms_20.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/ms_20.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 ms_20: ask “what can the KORG MS-20 do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (44)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/ms_20/wave_form |
3 | 0–127 | continuous | ||
/ms_20/pw |
4 | 0–127 | continuous | ||
/ms_20/scale |
6 | 0–127 | continuous | ||
/ms_20/vco_1_level |
10 | 0–127 | continuous | ||
/ms_20/cutoff_freq |
25 | 0–127 | continuous | ||
/ms_20/cutoff_freq |
31 | 0–127 | continuous | ||
/ms_20/wave_form |
11 | 0–127 | continuous | ||
/ms_20/pitch |
12 | 0–127 | continuous | ||
/ms_20/scale |
13 | 0–127 | continuous | ||
/ms_20/vco_2_level |
15 | 0–127 | continuous | ||
/ms_20/peak |
26 | 0–127 | continuous | ||
/ms_20/peak |
33 | 0–127 | continuous | ||
/ms_20/mg_t_ext |
17 | 0–127 | continuous | ||
/ms_20/portamento |
5 | 0–127 | continuous | ||
/ms_20/fine_tune |
19 | 0–127 | continuous | ||
/ms_20/wave_form |
22 | 0–127 | continuous | ||
/ms_20/mg_t_ext |
27 | 0–127 | continuous | ||
/ms_20/mg_t_ext |
34 | 0–127 | continuous | ||
/ms_20/eg1_ext |
18 | 0–127 | continuous | ||
/ms_20/volume |
7 | 0–127 | continuous | ||
/ms_20/mod_wheel |
1 | 0–127 | continuous | ||
/ms_20/frequency |
24 | 0–127 | continuous | ||
/ms_20/eg2_ext |
28 | 0–127 | continuous | ||
/ms_20/eg2_ext |
35 | 0–127 | continuous | ||
/ms_20/delay_time |
39 | 0–127 | continuous | ||
/ms_20/attack |
40 | 0–127 | continuous | ||
/ms_20/attack |
0 | 0–127 | continuous | ||
/ms_20/attack |
41 | 0–127 | continuous | ||
/ms_20/hold_time |
43 | 0–127 | continuous | ||
/ms_20/attack |
44 | 0–127 | continuous | ||
/ms_20/attack |
45 | 0–127 | continuous | ||
/ms_20/attack |
46 | 0–127 | continuous | ||
/ms_20/attack |
47 | 0–127 | continuous | ||
/ms_20/signal_level |
48 | 0–127 | continuous | ||
/ms_20/low_cut_freq |
49 | 0–127 | continuous | ||
/ms_20/high_cut_freq |
50 | 0–127 | continuous | ||
/ms_20/cv_amt |
51 | 0–127 | continuous | ||
/ms_20/threshold_lvl |
52 | 0–127 | continuous | ||
/ms_20/voices |
8 | 0–127 | continuous | ||
/ms_20/unison_spread |
9 | 0–127 | continuous | ||
/ms_20/analog |
16 | 0–127 | continuous | ||
/ms_20/pan |
14 | 0–127 | continuous | ||
/ms_20/bend_range |
29 | 0–127 | continuous | ||
/ms_20/transpose |
30 | 0–127 | continuous |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /ms_20/note/on <note> <velocity>, /ms_20/cc/<number> <value>, /ms_20/pitchbend <0-16383>, /ms_20/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.