We are cross posting, I appreciate ya'll trying to help this newbie so much! I've been do damn excited about this thing and been futzing around with it for days.
No, it would appear I tested it incorrectly the first time. I used a 4cm preset, but unplugged the cables from the AMP FX Loop, essentially hooked the unit up in 2CM, but then connected the
HXS SEND>HXS L/Mono RETURN with a separate patch cable. With that, the effects were coming through and amp controls were responsive.
I reconnected 4CM and went through the exact procedure you note above; with this I am getting sound/effects, etc. but the amp controls are now unresponsive.