Chase Bliss CBA PREAMP MKII: MIDI CC, NRPN and OSC map¶
The Chase Bliss CBA PREAMP MKII as named OSC addresses — 14 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | Chase Bliss CBA PREAMP MKII |
|---|---|
| Vendor | Chase Bliss |
| OSC prefix | /cba_preamp_mkii |
| Source | 🎛️ Derived from an Electra One community preset |
| Revision | per Electra preset |
| Upstream | electra-preset |
| Driver file | devices/chase-bliss/cba_preamp_mkii.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/chase-bliss/cba_preamp_mkii.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 cba_preamp_mkii: ask “what can the Chase Bliss CBA PREAMP MKII 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 |
|---|---|---|---|---|---|
/cba_preamp_mkii/volume |
14 | 0–127 | continuous | ||
/cba_preamp_mkii/treble |
15 | 0–127 | continuous | ||
/cba_preamp_mkii/mids |
16 | 0–127 | continuous | ||
/cba_preamp_mkii/freq |
17 | 0–127 | continuous | ||
/cba_preamp_mkii/bass |
18 | 0–127 | continuous | ||
/cba_preamp_mkii/gain |
19 | 0–127 | continuous | ||
/cba_preamp_mkii/expression |
100 | 0–127 | continuous | ||
/cba_preamp_mkii/jump |
22 | 0–127 | continuous | ||
/cba_preamp_mkii/mids |
23 | 0–127 | continuous | ||
/cba_preamp_mkii/q |
24 | 0–127 | continuous | ||
/cba_preamp_mkii/diode |
25 | 0–127 | continuous | ||
/cba_preamp_mkii/fuzz |
26 | 0–127 | continuous | ||
/cba_preamp_mkii/bypass |
102 | 0–127 | continuous | ||
/cba_preamp_mkii/0 |
27 | 0–127 | continuous |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /cba_preamp_mkii/note/on <note> <velocity>, /cba_preamp_mkii/cc/<number> <value>, /cba_preamp_mkii/pitchbend <0-16383>, /cba_preamp_mkii/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.