I cringed reading that. There were a lot of people using that technique long before BT. Max/Msp, csound, and many other programs allowed user to do this. Not to mention the old amiga scene trackers and old jungle artists with their "trackers".

https://www.youtube.com/watch?v=6iiK4MgIPtI https://www.youtube.com/watch?v=_fX4qoruQik https://www.youtube.com/watch?v=I9BfB9HMWlc