A few of us have tried that amp. Interesed to see how it works out for you. Adding an additional mixer seems like extra stuff you don't need to carry since it already has a very versitile mixer built in. One if the strong points of the unit.
Good luck with it.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer