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(no longer on the beatport site; tech.beatport doesn't seem to exist any more and the current beatport blog starts at 2015)

Yeah that's the one, I was looking at this post that uses Spotify and echonest too https://jmperezperez.com/bpm-detection-javascript/

Exactly, this one. :)

I wanted to try it with another transformation to see if it can achieve better results.