MFB Synth II: MIDI CC, NRPN and OSC map¶
The MFB Synth II as named OSC addresses — 34 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | MFB Synth II |
|---|---|
| Vendor | MFB |
| OSC prefix | /synth_ii |
| 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/mfb/synth_ii.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/mfb/synth_ii.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 synth_ii: ask “what can the MFB Synth II do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (34)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/synth_ii/general/glide |
5 | 0–127 | continuous | General | |
/synth_ii/general/mod_vco |
6 | 0–127 | continuous | General | |
/synth_ii/oscillators/pulse |
8 | 0–127 | continuous | Oscillators | |
/synth_ii/lfo/rate1 |
9 | 0–127 | continuous | LFO | |
/synth_ii/oscillators/interval_1 |
10 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/interval_2 |
11 | 0–127 | continuous | Oscillators | |
/synth_ii/lfo/rate2 |
12 | 0–127 | continuous | LFO | |
/synth_ii/mix/level_vco1 |
13 | 0–127 | continuous | Mix | |
/synth_ii/mix/level_vco2 |
14 | 0–127 | continuous | Mix | |
/synth_ii/mix/level_vco3 |
15 | 0–127 | continuous | Mix | |
/synth_ii/mix/level_noise |
16 | 0–127 | continuous | Mix | |
/synth_ii/mix/audio_in |
17 | 0–127 | continuous | Mix | |
/synth_ii/general/mod_vcf |
18 | 0–127 | continuous | General | |
/synth_ii/general/mod_vca |
19 | 0–127 | continuous | General | |
/synth_ii/filter/keyfollow |
20 | 0–127 | continuous | Filter | |
/synth_ii/filter/cutoff |
21 | 0–127 | continuous | Filter | |
/synth_ii/filter/emphasis |
22 | 0–127 | continuous | Filter | |
/synth_ii/filter/contour |
23 | 0–127 | continuous | Filter | |
/synth_ii/envelopes/attack1 |
24 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/decay1 |
25 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/sustain1 |
26 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/release1 |
27 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/attack2 |
28 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/decay2 |
29 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/sustain2 |
30 | 0–127 | continuous | Envelopes | |
/synth_ii/envelopes/release2 |
31 | 0–127 | continuous | Envelopes | |
/synth_ii/oscillators/octave1 |
80 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/wave1 |
81 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/octave2 |
82 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/wave2 |
83 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/octave3 |
84 | 0–127 | continuous | Oscillators | |
/synth_ii/oscillators/wave3 |
85 | 0–127 | continuous | Oscillators | |
/synth_ii/lfo/wave_mod1 |
86 | 0–127 | continuous | LFO | |
/synth_ii/lfo/wave_mod2 |
87 | 0–127 | continuous | LFO |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /synth_ii/note/on <note> <velocity>, /synth_ii/cc/<number> <value>, /synth_ii/pitchbend <0-16383>, /synth_ii/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.