I've been curious about this and currently don't have an frfr to try out in addition to my 4x12 mesa cab. I love the sound of the cab but we have some songs with acoustic that would really be nice to have frfr. My thinking is using say a 2x12 from powered monitor out (cabs off) and maybe a wedge (dxr10) from master out right with cabs on and you have best of both worlds. It would also give the ability to combine 2 different cab sounds. Curious if anyone has any experience with this and if there are any issues that would arise.