Main board (9004-2), for M-Audio Oxygen (V1) keyboard Turning off velocity

Hello,
I am here because I want to find some solution to turn off for sure velocity feature. I got two “Key contact board (9005-1), for M-Audio 25-note keyboard”. I have to make some maintenance for it but I have still often problem with the velocity. To explain: There is situation when I click the key, then when my finger is going up the note is stuck on and I need to click again the same note. It is annoying and impossible to play anything. I am using grand orgue and got option “Note without velocity”, by the way other programs do the same.
I want to download the program from the AT89S52 and try to modify the program to turn off the velocity procedure (counting time between contact first and second pin). No matter what I want to try it. I don’t want to try again to repair the key pads, because all note are working but often the second pad from the note is missed and from that I got always on note.

Is it possible to make this way modification?