Allen & Heath CQ · MIDI Message Generator

Build MIDI for A&H CQ mixers (CQ-12T/18T/20B) — scene recall & channel mutes as ready-to-send bytes. Over USB-MIDI or MIDI-over-TCP.

Recall a scene

Bank Select then Program Change: Bn 00 00 + Cn pc. On CQ the bank is always 0; the program change (0–127) selects the scene. The scene must exist on the CQ.

Mute a channel

NRPN mute: Bn 63 MSB · Bn 62 LSB · Bn 06 00 · Bn 26 <1|0>, where MSB/LSB is the channel's parameter number from the CQ MIDI reference tables.

Custom MIDI message

A generic MIDI message builder on the channel above. Values are 0–127. Handy for Soft Key notes and MIDI fader-strip CCs.

This tool outputs MIDI, not OSC. Send the bytes over USB-MIDI or MIDI-over-TCP to the CQ's Network port (A&H uses TCP 51325). Set the mixer's MIDI channel to match the channel above. CQ fader levels use a send-matrix (source → destination); use the Custom tab with the reference tables for those — this tool covers scenes & mutes.
Generated MIDI
Hex
Decimal

Manual & examples

Copy any ready-made message below into your MIDI sender. Bytes are shown in hex, following Allen & Heath's CQ MIDI protocol V1.2 (examples use MIDI channel 1).

STEP 1

Enable MIDI on the CQ

In the CQ's utility/MIDI settings, note the MIDI channel and set it above so the parameter bytes match.

STEP 2

Build a message above

Pick a tab (Scene, Mute…), set the fields, and the panel on the right shows the MIDI bytes live.

STEP 3

Send the bytes

Send via USB-MIDI, or MIDI-over-TCP to the CQ's IP on port 51325.

Examples assume MIDI channel 1 (status nibble 0). Mute uses the CQ parameter tables — Input 1 = MSB 00 LSB 00, Main LR = 00 44, DCA 1 = 02 00, Mute Group 1 = 04 00.