osc-bridge Test Synth MIDI CC chart, NRPN and OSC map¶
The osc-bridge Test Synth MIDI implementation: 5 CC, 1 NRPN, 3 drum sounds, each named, for Claude (MCP), SuperCollider or any OSC app.
| Device | osc-bridge Test Synth |
|---|---|
| Vendor | osc-bridge |
| OSC prefix | /test_synth |
| Source | 🧪 Virtual test device, simulated by osc-bridge connect --test-synth |
| Firmware | 1.0 |
| Revision | 1.0 |
| Upstream | test-fixture |
| Driver file | devices/examples/test_synth.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/examples/test_synth.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 test_synth: ask “what can the osc-bridge Test Synth do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (6)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/test_synth/filter/cutoff |
74 | 0–127 | continuous | ||
/test_synth/filter/resonance |
71 | 0–127 | continuous | ||
/test_synth/amp/attack |
73 | 0–127 | continuous | ||
/test_synth/amp/release |
72 | 0–127 | continuous | ||
/test_synth/osc/waveform |
70 | 0–3 | discrete | ||
/test_synth/lfo/rate |
0 / 1 | 0–16383 | continuous |
Drum sounds (3)¶
Send <address> [velocity] [note] [channel] to fire the sound (Note On).
| OSC address | Sound | Note(s) | Channel | Velocity |
|---|---|---|---|---|
/test_synth/drum/kick |
Kick | 36 | 10 | |
/test_synth/drum/snare |
Snare | 38 | 10 | |
/test_synth/drum/hat |
Closed hat | 42 | 10 |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /test_synth/note/on <note> <velocity>, /test_synth/cc/<number> <value>, /test_synth/pitchbend <0-16383>, /test_synth/program_change <n>.
Frequently asked questions¶
Which MIDI CC controls the filter cutoff on the osc-bridge Test Synth?
CC 74 (0–127), named /test_synth/filter/cutoff in SynthHub's map.
How many parameters of the osc-bridge Test Synth can be controlled over MIDI?
SynthHub's map of the osc-bridge Test Synth lists 5 MIDI CC and 1 NRPN 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 osc-bridge Test Synth?
Yes: SynthHub's hosted MCP server knows the osc-bridge Test Synth's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.