In MIDI, you start a note with
• Note On, Velocity 1 to 127
and you end a note with
• Note On, Velocity 0
• Note Off, Velocity 0 to 127.
If your software doesn't recognize Note Off Velocity 0 as the end of a note, it is not following the MIDI standard.
It sounds like you want to get your Akai MPD226 to work with your software. What software is it?
I found the Akai MPD226 manual
, but I don't see any obvious way to change the Note Off Velocity that it sends.
If you tell us what software you are using, maybe it has some setting you can change to get your Akai MPD226 to work properly?