GMSync

GMSync is the ultimate way to sync elements of your game to music. Want to make the background pulse with the beat? Looking to trigger something at a precise moment in your song? Making a rhythm game? This is the way to do it.

GMSync provides a no-brainer approach to perfect music syncing in GMS 2.3+. It allows you to specify music note lengths to sync to, and works directly with track positions. This means it will never de-sync due to frame rate stutters or moving the window around. With support for patterns and even gamespeed independent timestamp triggers, this is a one-stop shop for everything you need to perfectly sync audio to game elements.

 GMSync uses pure GML, making it fully portable and easy to tweak.

View the online documentation here