Just plug everything into the BA330 and use one of its line outs to the A1. The Ba330 will still give you somewhat of a stereo effect but the line out to the other amp would be mono.
That was my reason for returning the BA330, not enough power and if you have to start adding extra amps I felt that just a normal stereo PA would be better. Use one or both speakers as the venue dictates. If the Roland had some decent power I was ready to buy two since I liked the mixer section so much.
Good luck
Bill in NJ
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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