Is it possible to group all of my drum sounds to a single stereo track and have an insert on it? I’d like to process all of my drums with an external processor and have control of them on a ‘drum mix’ fader.
You can indeed do this on SQ. The SQ can have up to 12 groups (configured in the bus config page) and every group has an insert point which can be patched to any input/output socket (Local/SLink/USB/IO Port).
Please go to support.allen-heath.com to start a ticket if you need assistance setting this up.