I bought the BK-5 because I had previously owned the BK-7M module which was a great piece of gear. I thought the BK-5 would be the same but with a keyboard. NOT AT ALL!! The BK-5 overall sound was much like a toy compared to the BK-7M and the RH lead voices were almost useless for my
40's, and 50's style music. Don't know if you have noticed, but the general interest in the Bk-5 has dropped off a ton.

On the other hand I bought the Korg MicroArranger and actually use it as a stand-a-lone keyboard for gigs. I now have the PA600 on order.

Deane