I always preferred Jammer to BIAB, although the latter definitely can produce something useable with less effort. I just think that for most genres the BIAB styles range from fair to very poor, with the exception of the Jazz styles. Most of what I've done in the Jazz genre with BIAB sounds pretty good.
I was very used to J Pro version 4. It was real easy to mix and match drum pieces with that interface. J Pro 5 introduced a much different interface and added a couple of steps, and for a while I didn't like it at all. Now that I realize how much better it is for making original styles, I am beginning to like it again. I say better because you can now input real midi data for new styles into it's sequencer.
I've had several discussions with the Jammer guys ( Soundtrek ) in an effort to convince them that adding Vst functionality would be very useful and might even help bring their product more into the mainstream, and they agreed, but said that at least for now it wasn't happening.
As it exists now, I think Jammer only serves a small niche market, but I think Soundtrek is happy with it anyway. Having Dxi functionality( and vst with my cakewalk wrapper ) in BIAB is a big plus to me.
AJ
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AJ