Hi LX funny that you just have the same problem as I wanted to post now. I noticed the same effect, compared to the midio128 application where it is possible to trigger the led with midi. as far as I can see the ain64_din128_dout128_v1_3 - application is only a test application, and will lack the functionalities of midio128 (the amount of code speaks for this). to get to the required result we either have to expand the midio128 application so that it can handle AIN as well, or if the ain64_din128_dout128 can be expanded so the DOUT reacts on midi-events. Maybe some of the experts can give us a hint or two? however, I am not familiar with PIC programming or assembler, so for the moment I cant give any help, but we might join forces... ;-) so long martin