Patrick,
Would it be possible to adapt this version of the bracket for use in a "rigid divider frame style" ORCA bag for running the M2D2 in a vertical orientation?
Very interesting report. I have a 4Minx and I never noticed that tone with my unit. It has been awhile since I last used the 4Minx so I will have to test it to see if I get the same tone that you did.