Hi Roberto,
Congrats on your BK-7m! I'm using mine with my Tyros 4, controlling both from my Roland accordion! It works great. The voices from the Tyros together with the styles of the BK-7m make an anawesome combination.
I'm still learning how to control certain parameters via foot switches and directly from the accordion, but its coming along.
Basically what I've done so far is to create performance banks of voices on the T4, (8 per bank), that I can use w/BK-7 or T4 styles. For example, Jazzband, Polkaband, countryband. Dixieband; and so on.
I havn't tryed to incorporate voices from BK-7 yet because I find them difficult to access on the fly. Hopefully Roland will do an upgrradee wherebby the one touch settings are easily accessable form a footswitch.
Good Luck w/your setup.
Don P
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GENOS, Roland FR-8X V Accordion, Bose Compacts.