I have the MR-816CSX and the CC121
It would be really cool to if you could somehow connect two in a stand alone mode so that you could control MR with the CC-121; volume, tone’s, reverbs, compressors.
The MR816 would need a USB port and the CC121 would need a viewing window to show which channel and function you were on.
Obviously too late for my current products, but it would be interesting for new products.