Your audio device has latency. Fix: Go to Options > Gameplay > Note Offset . Tap along to a song and adjust by +-50ms until the notes align with the beat.

Unlike older engines where adding a new week required recompiling the game, Psych Engine allows modders to add weeks, characters, and songs via simple JSON files located in the data and weeks folders. v0.6.3 refines this system, making it easier than ever to pack multiple mods into a single build.