Cyma RND MIDI CC chart, NRPN and OSC map¶
The Cyma RND MIDI implementation: 5 CC, each named, for Claude (MCP), SuperCollider or any OSC app.
| Device | Cyma RND |
|---|---|
| Vendor | Cyma |
| OSC prefix | /rnd |
| Source | 📦 Derived from MIDI Guide (community CC/NRPN data) |
| Firmware | unknown |
| Revision | per pencilresearch canonical CSV |
| Upstream | pencilresearch |
| Data licence | CC-BY-SA-4.0 — MIDI Guide (https://midi.guide) by Pencil Research and contributors |
| Driver file | devices/cyma/rnd.pencilresearch.fw-unknown.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/cyma/rnd.pencilresearch.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 rnd: ask “what can the Cyma RND do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (5)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/rnd/global_control/master_volume |
7 | 0–127 | continuous | Global control | |
/rnd/global_control/master_reverb_level |
91 | 0–127 | continuous | Global control | |
/rnd/global_control/scale_selection |
9 | 0–127 | continuous | Global control | |
/rnd/track_control/track_volume |
7 | 0–127 | continuous | Track control | |
/rnd/track_control/track_reverb_level |
91 | 0–127 | continuous | Track control |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /rnd/note/on <note> <velocity>, /rnd/cc/<number> <value>, /rnd/pitchbend <0-16383>, /rnd/program_change <n>.
Limitations¶
CC/NRPN only. SysEx (preset management, display control, bulk dump/load, vendor-proprietary opcodes) is NOT covered by pencilresearch. To extend this device with SysEx, sniff the vendor editor, add `sysex.header/footer` + `commands` blocks, and use `update_device.md` PR template.
Frequently asked questions¶
How many parameters of the Cyma RND can be controlled over MIDI?
SynthHub's map of the Cyma RND lists 5 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 Cyma RND?
Yes: SynthHub's hosted MCP server knows the Cyma RND's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.