I was about to ask if you had tried the roland CM30. I like the stereo link function that it offers and look what I found.
http://www.synthzone.com/forum/ubbthreads.php/topics/222293/Tried_the_Mackie_SM_150_and_thDo you agree?
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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