Here's my situation.

I can control the BK-7m module from the Tyros 4 without many problems (some chord reocgnition issues)

I can play T4 styles or Roland styles, yammy voices or Roland voices, or combine the voices.

When I put the accordion into the mix (going into the T4), the accordion controls the T4 but not the BK-7m. BTW, I've done this in reverse with the same results (Accordion to BK7m to T4).

Before I spend my $40.00, will this solve my problem?

MIDI SOLUTIONS THRU.

"The MIDI Solutions Thru provides 2 MIDI outputs from a single MIDI input. Use it to provide extra MIDI outputs at any point in the MIDI chain."

From the accordion hook one out to the T4 and the other to BK7m.

What do yuu think?
Don P