I just reheased with "Gregorian" for an upcoming Europe-Tour and I used my Matrix Q12a-FRFR-cab, actually for the very first time.
The Q12a did a great job, main outs went stereo to desk, monitor out mono to the Q12a as my "personal" monitor. Main Out-EQ was flat, Monitor Out-EQ had a little bass boost and less treble, that's it.
All guitars (nylon-string, steel-string, electric) had a great sound and feel, the only consequence: the producer insisted that the 2nd guitar player (using a Boss GT-100) has to play a KPA on the tour, too....
[Blocked Image: http://i1078.photobucket.com/albums/w489/kingbee789/Q12a_zps10c28745.jpg]