Strymon Deco: MIDI CC, NRPN and OSC map¶
The Strymon Deco as named OSC addresses — 22 CC — ready to use from Claude (MCP), SuperCollider, Sonic Pi, TouchDesigner or any OSC app via osc-bridge.
| Device | Strymon Deco |
|---|---|
| Vendor | Strymon |
| OSC prefix | /deco |
| 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/strymon/deco.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/strymon/deco.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 deco: ask “what can the Strymon Deco do?” and it reads this map with list_routes. See the MCP guide.
MIDI CC and NRPN parameters (22)¶
| OSC address | CC | NRPN (MSB/LSB) | Range | Nature | Section |
|---|---|---|---|---|---|
/deco/control/bank_select |
0 | 0–2 | continuous | Control | |
/deco/control/tape_saturation_on_off |
10 | 0–127 | continuous | Control | |
/deco/primary/voice |
11 | 1–2 | continuous | Primary | |
/deco/primary/saturation |
12 | 0–127 | continuous | Primary | |
/deco/primary/volume |
13 | 0–127 | continuous | Primary | |
/deco/primary/tone |
14 | 0–127 | continuous | Primary | |
/deco/hidden/low_trim |
15 | 0–127 | continuous | Hidden | |
/deco/control/doubletracker_on_off |
16 | 0–127 | continuous | Control | |
/deco/primary/type |
17 | 1–3 | continuous | Primary | |
/deco/primary/lag_time |
18 | 0–127 | continuous | Primary | |
/deco/primary/wobble |
19 | 0–127 | continuous | Primary | |
/deco/primary/blend |
20 | 0–127 | continuous | Primary | |
/deco/hidden/doubletracker_boost_cut |
21 | 0–127 | continuous | Hidden | |
/deco/hidden/auto_flange_time |
22 | 0–127 | continuous | Hidden | |
/deco/hidden/wide_stereo_mode_on_off |
23 | 0–127 | continuous | Hidden | |
/deco/control/midi_clock_tempo_mult_div |
25 | 0–6 | continuous | Control | |
/deco/control/bypass_on_a_and_b |
33 | 0–127 | continuous | Control | |
/deco/control/midi_expression_on_off |
60 | 0–127 | continuous | Control | |
/deco/control/midi_clock_on_off |
63 | 0–127 | continuous | Control | |
/deco/control/remote_tap |
93 | 0–127 | continuous | Control | |
/deco/control/auto_flange |
97 | 0–127 | continuous | Control | |
/deco/expression/pedal |
100 | 0–127 | continuous | Expression |
Performance MIDI¶
Notes, pitch bend and any CC are also available: /deco/note/on <note> <velocity>, /deco/cc/<number> <value>, /deco/pitchbend <0-16383>, /deco/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.