While I don’t disagree that 3 matrixes are pretty limiting, the blunt truth is that you should have used/bought a different console if this is going to be a long term problem for you. Based on the number of requests to increase the matrixes on the SQ series through the years, it sure seems like A&H isn’t going to be accommodating this change. There are some potential work arounds – like using additional hardware (perhaps a separate unit for speaker processing, etc), but this is a hard limitation that appears to be here to stay.