Royce thanks a lot, it works!
if i understand well, the $10 $00 $20 $01 means (in a "primitive" way): number of Bank, number of part (and midi channel too, that is the mc909, every part has its own midi channel), and $51 $20 tells to select Patch...right?
what however surprise me is that when i sent sysex from mc909 to midiox (pushing on INC/DEC), it sent those Bank and Patch strings of that lenght...
Bank
F0 41 10 00 59 12 10 00 20 01 51 00 00 7E F7
Patch
F0 41 10 00 59 12 10 00 20 01 52 00 03 7A F7
so now i cannot say why there is one "XY" number more...
another question is: why the sysex of level,rev,key pan and out sent by the mc909 are different (not in lenght)from the ones sent by the BCR2000...? could the midi implementation manual i attached clarify that and where? i saw on page 8 something that could be concerned to that argument, but i'm a bit confused...and this bring me to the last question: the $10 $00 $20 $01(bank) and $51 $20 (patch)...where to find those on that midi implemantation manual?
thanks again!