Hey there, glad you're enjoying it!! Yeah, I think that happens when you play an audio file has a different sample rate than the others. To fix that, you can either:
- drag your MP3 into something like Audacity, change the project rate (it should be in the bottom left corner) to 44100 Hz (or the same rate as the rest of your files), then re-export the MP3
- change the sample rate with ffmpeg: `ffmpeg -i input.mp3 -ar 44100 output.mp3`
That should fix the issue. Hope this helps! :)