devices/chase-bliss/preamp_mkii.electra-jarvis-sheppard.fw-unknown.jsonEdit on GitHubJSONChase Bliss Preamp MKII (per Electra preset) MIDI CC chart, NRPN and OSC map
The Chase Bliss Preamp MKII MIDI implementation: 14 CC, each named, for Claude (MCP), SuperCollider or any OSC app.
- sourceElectra One preset
- real unitnot yet checked
Not checked on a real Chase Bliss Preamp MKII yet. Own one? Load a sound or send a control, and tell us whether it worked.
- Maker
- Chase Bliss
- Version
- per Electra preset
- Source
- Electra One preset
- OSC prefix
/preamp_mkii
Use 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/preamp_mkii.electra-jarvis-sheppard.fw-unknown.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 preamp_mkii: ask “what can the Chase Bliss Preamp MKII do?” and it reads this map with list_routes. See the MCP guide.
MIDI controls
14 controls, each with its number, its range and the name to send
| Control | CC | Range | Name to send |
|---|---|---|---|
| Volume | 14 | 0–127 | /preamp_mkii/volume |
| Treble | 15 | 0–127 | /preamp_mkii/treble |
| Mids | 16 | 0–127 | /preamp_mkii/mids |
| Freq | 17 | 0–127 | /preamp_mkii/freq |
| Bass | 18 | 0–127 | /preamp_mkii/bass |
| Gain | 19 | 0–127 | /preamp_mkii/gain |
| Expression | 100 | 0–127 | /preamp_mkii/expression |
| Jump | 22 | 0–127 | /preamp_mkii/jump |
| Mids | 23 | 0–127 | /preamp_mkii/mids |
| Q | 24 | 0–127 | /preamp_mkii/q |
| Diode | 25 | 0–127 | /preamp_mkii/diode |
| Fuzz | 26 | 0–127 | /preamp_mkii/fuzz |
| Bypass | 102 | 0–127 | /preamp_mkii/bypass |
| 0 | 27 | 0–127 | /preamp_mkii/0 |
Performance MIDI
Notes, pitch bend and any CC are also available: /preamp_mkii/note/on <note> <velocity>, /preamp_mkii/cc/<number> <value>, /preamp_mkii/pitchbend <0-16383>, /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.
Other versions
The Chase Bliss Preamp MKII is mapped in 2 versions. per pencilresearch canonical CSV.
Frequently asked questions
How many parameters of the Chase Bliss Preamp MKII can be controlled over MIDI?
SynthHub's map of the Chase Bliss Preamp MKII lists 14 MIDI CC parameters, each with its number, range and a readable name; the full chart is on this page.
Can an AI agent like Claude control the Chase Bliss Preamp MKII?
Yes: SynthHub's hosted MCP server knows the Chase Bliss Preamp MKII's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.