Written from devices/yamaha/dx7.electra-community-editor-nt-v1.fw-unknown.jsonEdit on GitHub JSON

Yamaha DX7 (per Electra preset) MIDI CC chart, NRPN and OSC map

The Yamaha DX7 MIDI implementation: 55 CC, 36 SysEx commands, each named, for Claude (MCP), SuperCollider or any OSC app.

sourceElectra One preset
real unitnot yet checked

Not checked on a real Yamaha DX7 yet. Own one? Load a sound or send a control, and tell us whether it worked.

Maker: Yamaha
Version: per Electra preset
Source: Electra One preset
OSC prefix: /dx7

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/yamaha/dx7.electra-community-editor-nt-v1.fw-unknown.json --out-port <N> --in-port <M>

Then send OSC to 127.0.0.1:7777, for example:

osc-bridge osc-send /dx7/chord_enable 63

From Claude or any MCP client, the osc-bridge mcp server exposes this driver as dx7: ask “what can the Yamaha DX7 do?” and it reads this map with list_routes. See the MCP guide.

MIDI controls

91 controls, each with its number, its range and the name to send

Control	CC	Range	Name to send
Chord enable	61	0–127	`/dx7/chord_enable`
Key	62	0–127	`/dx7/key`
Mode	63	0–127	`/dx7/mode`
Scale	64	0–127	`/dx7/scale`
Shape	65	0–127	`/dx7/shape`
Inversion	66	0–127	`/dx7/inversion`
Root deg	67	0–127	`/dx7/root_deg`
Cantus primus	68	0–127	`/dx7/cantus_primus`
Position	69	0–127	`/dx7/position`
Break direct	70	0–127	`/dx7/break_direct`
Break time	71	0–127	`/dx7/break_time`
Arpeggio	72	0–127	`/dx7/arpeggio`
Octave range	73	0–127	`/dx7/octave_range`
Coarse tune	10	0–127	`/dx7/coarse_tune`
Fine tune	0 / 32	-100–100	`/dx7/fine_tune`
Brightness	11	0–127	`/dx7/brightness`
Env scale	12	0–127	`/dx7/env_scale`
Gain	7	0–127	`/dx7/gain`
Press vol	1 / 33	-100–100	`/dx7/press_vol`
Press brt	2 / 34	-200–200	`/dx7/press_brt`
Midi ch	30	0–127	`/dx7/midi_ch`
Sustain	14	0–127	`/dx7/sustain`
Bend range	15	0–48	`/dx7/bend_range`
Sustain mode	13	0–127	`/dx7/sustain_mode`
Mute poly fm	19	0–127	`/dx7/mute_poly_fm`
Left out	28	0–64	`/dx7/left_out`
Right out	27	0–64	`/dx7/right_out`
Reverb mix	90	0–127	`/dx7/reverb_mix`
Time	91	0–127	`/dx7/time`
Model	92	0–127	`/dx7/model`
Size	93	0–127	`/dx7/size`
Mod speed	94	1–500	`/dx7/mod_speed`
Mod depth	95	0–127	`/dx7/mod_depth`
High damp	96	0–127	`/dx7/high_damp`
Early gain	97	0–127	`/dx7/early_gain`
Diffuse gain	98	0–127	`/dx7/diffuse_gain`
Output mode	99	0–127	`/dx7/output_mode`
Bypass reverb	100	0–127	`/dx7/bypass_reverb`
Delay mix	102	0–127	`/dx7/delay_mix`
Model	101	0–127	`/dx7/model`
Level	103	0–127	`/dx7/level`
Time	104	0–127	`/dx7/time`
Feedback	105	0–127	`/dx7/feedback`
Initial pan	106	0–127	`/dx7/initial_pan`
Delay multiple	107	0–127	`/dx7/delay_multiple`
Clock source	108	0–127	`/dx7/clock_source`
Midi divisor	109	0–127	`/dx7/midi_divisor`
Midi numerator	110	0–127	`/dx7/midi_numerator`
Output mode	112	0–127	`/dx7/output_mode`
Bypass delay	111	0–127	`/dx7/bypass_delay`
Chorus mode	113	0–127	`/dx7/chorus_mode`
Output mode	114	0–127	`/dx7/output_mode`
Bypass chorus	115	0–127	`/dx7/bypass_chorus`
Bank	20	0–127	`/dx7/bank`
Voice	21	0–127	`/dx7/voice`

SysEx commands

Command	Arguments	Name to send
Feedback	val: u7	`/dx7/feedback`
Pitch eg	val: u7	`/dx7/pitch_eg`
Lfo key sync	val: u7	`/dx7/lfo_key_sync`
Osc key sync	val: u7	`/dx7/osc_key_sync`
Lfo speed	val: u7	`/dx7/lfo_speed`
Lfo delay	val: u7	`/dx7/lfo_delay`
Key transpose	val: u7	`/dx7/key_transpose`
P mod depth	val: u7	`/dx7/p_mod_depth`
P mod sens	val: u7	`/dx7/p_mod_sens`
A mod depth	val: u7	`/dx7/a_mod_depth`
Output level	val: u7	`/dx7/output_level`
Eg level rate	val: u7	`/dx7/eg_level_rate`
Freq fine	val: u7	`/dx7/freq_fine`
Ratio fixed	val: u7	`/dx7/ratio_fixed`
A mod sens	val: u7	`/dx7/a_mod_sens`
Detune	val: u7	`/dx7/detune`
Velocity sens	val: u7	`/dx7/velocity_sens`
Lfo waveform	val: u7	`/dx7/lfo_waveform`
Char1	val: u7	`/dx7/char1`
Char2	val: u7	`/dx7/char2`
Char3	val: u7	`/dx7/char3`
Char4	val: u7	`/dx7/char4`
Char5	val: u7	`/dx7/char5`
Char6	val: u7	`/dx7/char6`
Char7	val: u7	`/dx7/char7`
Char8	val: u7	`/dx7/char8`
Char9	val: u7	`/dx7/char9`
Algorithm	val: u7	`/dx7/algorithm`
Op6 freq fine	val: u7	`/dx7/op6_freq_fine`
L depth	val: u7	`/dx7/l_depth`
Rate scaling	val: u7	`/dx7/rate_scaling`
R depth	val: u7	`/dx7/r_depth`
L curve	val: u7	`/dx7/l_curve`
Break point	val: u7	`/dx7/break_point`
R curve	val: u7	`/dx7/r_curve`
Freq coarse	val: u7	`/dx7/freq_coarse`

Performance MIDI

Notes, pitch bend and any CC are also available: /dx7/note/on <note> <velocity>, /dx7/cc/<number> <value>, /dx7/pitchbend <0-16383>, /dx7/program_change <n>.

JSON

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 Yamaha DX7 is mapped in 3 versions. per Electra preset, per KnobKraft Orm adaptation 'Yamaha DX7'.

Frequently asked questions

Which MIDI CC controls the filter cutoff on the Yamaha DX7?

CC 11 (0–127), named /dx7/brightness in SynthHub's map.

How many parameters of the Yamaha DX7 can be controlled over MIDI?

SynthHub's map of the Yamaha DX7 lists 55 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 Yamaha DX7?

Yes: SynthHub's hosted MCP server knows the Yamaha DX7's MIDI map, and its browser relay lets the agent send it parameter changes or load a sound, each sound change confirmed by you.