Waldorf RackAttack: MIDI CC, NRPN and OSC map¶
The Waldorf RackAttack as named OSC addresses — 41 SysEx commands — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | Waldorf RackAttack |
|---|---|
| Vendor | Waldorf |
| OSC prefix | /rackattack |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per Electra preset |
| Upstream | electra-preset |
| Driver file | devices/waldorf/rackattack.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/waldorf/rackattack.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 rackattack: ask “what can the Waldorf RackAttack do?” and it reads this map with list_routes. See the MCP guide.
SysEx commands (41)¶
| OSC address | Arguments |
|---|---|
/rackattack/shape |
val: u7 |
/rackattack/pitch |
val: u7 |
/rackattack/detune |
val: u7 |
/rackattack/pitch_mod |
val: u7 |
/rackattack/fm |
val: u7 |
/rackattack/fm_mod |
val: u7 |
/rackattack/pitch_ctrl |
val: u7 |
/rackattack/cutoff_mod |
val: u7 |
/rackattack/filter_ctrl |
val: u7 |
/rackattack/osc1_mix |
val: u7 |
/rackattack/fm_ctrl |
val: u7 |
/rackattack/osc2_mod |
val: u7 |
/rackattack/ringmod |
val: u7 |
/rackattack/crack_mix |
val: u7 |
/rackattack/osc2_mix |
val: u7 |
/rackattack/crack_speed |
val: u7 |
/rackattack/crack_length |
val: u7 |
/rackattack/cutoff |
val: u7 |
/rackattack/resonance |
val: u7 |
/rackattack/type |
val: u7 |
/rackattack/drive |
val: u7 |
/rackattack/volume |
val: u7 |
/rackattack/pan |
val: u7 |
/rackattack/volume_mod |
val: u7 |
/rackattack/pan_mod |
val: u7 |
/rackattack/volume_ctrl |
val: u7 |
/rackattack/pan_ctrl |
val: u7 |
/rackattack/attack |
val: u7 |
/rackattack/decay |
val: u7 |
/rackattack/sustain |
val: u7 |
/rackattack/rel |
val: u7 |
/rackattack/speed |
val: u7 |
/rackattack/sync |
val: u7 |
/rackattack/one_shot |
val: u7 |
/rackattack/mod |
val: u7 |
/rackattack/select |
val: u7 |
/rackattack/dry_out |
val: u7 |
/rackattack/mix |
val: u7 |
/rackattack/tuned_chl |
val: u7 |
/rackattack/transpose |
val: u7 |
/rackattack/wave_shape |
val: u7 |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /rackattack/note/on <note> <velocity>, /rackattack/cc/<number> <value>, /rackattack/pitchbend <0-16383>, /rackattack/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.