If I understand the block diagrams correctly, sourcing a matrix channel from the main L R channel is only possible after the process block. I use a matrix channel sourced from the main channel for stereo recordings of rehearsals and gigs. I know there are workarounds but I would appreciate the means to process the main L R channel without affecting a matrix channel sourced form the mains. In short I like to have the choice to source a matrix channel pre of post processing block of the main L R channel.
Gr Tom