Hi @Dafydd,
The reason this happens is because you can control mixer parameters (like fader levels, mutes PEQ etc…) using MIDI.
You can also record the MIDI being sent out of the mixer for automation purposes as well as use it to sync 3rd party system controllers.
A scene recall changes lots of parameters and so a lot of MIDI messages will be sent.
These messages are transmitted over USB and via TCP/IP on the network.
The MIDI channel that you can set (in ‘Setup > Control > MIDI’) is the MIDI channel for control to and from the mixer itself and the automated (+1) channel is used for DAW Control by the MIDI channel strips on the custom layer.
So to avoid these messages from triggering things in a DAW, you need to prevent the track in the DAW from ‘listening’ to that MIDI channel and/or the Qu MIDI device entirely.
A quick search suggests that Garage Band lacks the ability to disconnect MIDI controllers, so you may need to achieve what you want here by removing the device from macOS using the Audio MIDI setup.
Probably best to save a copy of the setup before you do 🙂
Thanks,
Keith.