It doesn't seem to work with a simple recording of a metronome at 100BPM. I have 4 various of the file, which you can find here: https://api.edgeofdusk.com/public/misc/100BPM_mono.mp3 https://api.edgeofdusk.com/public/misc/100BPM_mono.wav https://api.edgeofdusk.com/public/misc/100BPM_stereo.mp3 https://api.edgeofdusk.com/public/misc/100BPM_stereo.wav It does work with any song that I throw at it.