Thanks, a lot, Jman. I've seen some other posts of yours. In fact, I almost resurrected a thread that was seemingly the exact same topic back in 2015 that you were helping a lot on. But, when it got to the root of that thread's OP's problem they wanted something different altogether.
Sounds like maybe I'm not missing anything. I just wanted to audition other patches with my existing midi performance because I'm tracking all the rest of the band too. Rather than me asking the whole band, "hey, can you guys all play that same passage 20 times while I check out all the piano and EP patches to see which I like best?"
I bought this 350 because it's easy to practice at home with, has weighted keys, and is super light for gigging out. I was using a Motif ES8, but it weighed nearly 80 lbs and was about 100 lbs in the case.
I'm not sure what I'm going to do. If I can't audition sounds while playing back midi I may have to consider switching to virtual instrument. I really don't want to have to gig with a computer too. I already have enough gear to pack, setup, and hope works as it is.