UPD: I am not allowed to post links here, all I can say is that the URL starts with "multiplayerpiano" and ends with ".com" ;) Thank you in advance!
---Original review---
Thank you! Finally I can use my midi keyboard on PianoRhythm, however it doesn't seem to work on multiplayerpiano, so this addon might need some improvement
(just tested it with your 'select midi' example, it works as well. Good job!)