Ableton Chorus2: MIDI CC, NRPN and OSC map¶
The Ableton Chorus2 as named OSC addresses — 14 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | Ableton Chorus2 |
|---|---|
| Vendor | Ableton |
| OSC prefix | /chorus2 |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per Electra preset |
| Upstream | electra-preset |
| Driver file | devices/ableton/chorus2.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/ableton/chorus2.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 chorus2: ask “what can the Ableton Chorus2 do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (14)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/chorus2/hpf_enabled |
12 | 0–127 | continuous | ||
/chorus2/mode |
13 | 0–127 | continuous | ||
/chorus2/width |
9 / 41 | 0–2000 | continuous | ||
/chorus2/output |
3 / 35 | 0–16383 | continuous | ||
/chorus2/warmth |
8 / 40 | 0–1000 | continuous | ||
/chorus2/hpf_freq |
4 / 36 | 0–16383 | continuous | ||
/chorus2/rate |
6 / 38 | 0–16383 | continuous | ||
/chorus2/amount |
0 / 32 | 0–1000 | continuous | ||
/chorus2/feedback |
2 / 34 | 0–990 | continuous | ||
/chorus2/fb_inv |
11 | 0–127 | continuous | ||
/chorus2/dry_wet |
1 / 33 | 0–1000 | continuous | ||
/chorus2/offset |
5 / 37 | 0–180 | continuous | ||
/chorus2/shaping |
7 / 39 | 0–1000 | continuous | ||
/chorus2/device_on |
10 | 0–127 | continuous |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /chorus2/note/on <note> <velocity>, /chorus2/cc/<number> <value>, /chorus2/pitchbend <0-16383>, /chorus2/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.