Hi Bill,
I don't know if you are aware but there is a forum at YahooGroups.com that is devoted to the BK. There is much info available there as well as extra styles, "how to do it" files ETC.
I've had my BK-7m for a few months and these are my thoughts.
Many of the styles are very good and some of the sounds OK.
The biggest disappointment for me is in the way individual sounds have to be selected. there are no dedicated buttons to access them, i.e. piano, guitar, strings. It has to be done from inside menus, by pushing the data wheel, then selecting the sound bank and then the sound.
Also, there are One Touch Settings for each style, however, these are not linked to the variation buttons in such a way as to be selected by footswitch. So, for me as an accordion player, sound selection on the fly is almost impossible since a button on the module itself has to be pushed by hand to change a one-touch-sound; unless everything is programmed into a performance.
In that case, to change individual sounds you would have to save the style several times as a separate performance with a different voice in order to have multiple sounds in a song.
All that said, while I'm not too happy, our friend DonM is using his on gigs quite successfully, but he can speak for himself.
While I havn't given up completely, I'll just say, in the end, the BK-7m may not work for me!
Don P
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GENOS, Roland FR-8X V Accordion, Bose Compacts.