Start here I guess - https://docs.hise.audio/hise-modules/midi-processors/list/midiplayer.html#using-the-midi-player

@plugmakr At this point a snippet might help us to help you better than a code block...

@Straticah if the problem is bound to your project i would see if its still there if you create a whole new project

@plugmakr Aha I see. You will get the best results if you can create the entire GUI within HISE using paint routines and look and feel rather than using images. You'll potentially also save a lot of RAM.

@plugmakr Nevermind..I used my reading skills.