After watching it seems like every single video ever made about the SQ-6 mixer on youtube and working with my board for over two years, I still had some questions that I just could not find any answers for. Until I landed on David's SQ training video. I was pretty experienced with my board and knew quite a bit going into the training but I finally put the last pieces together and was able to configure some pretty complex routing, recording and monitoring setup thanks to David's excellent teachings. Definitively the best $30 I've spent since the day I got my SQ-6 back in March of 2019. If David were to come out with an "advanced / expert" version showing more complex setups and configurations, especially recording a large concert to a DAW I would be all over that in a minute without question.
If you own an Allen and Heath SQ mixer, BUY this course NOW. You will not regret it, I just wished I would have found it 2 years ago as opposed to last month !.