Peter Raffensperger is the man behind Faction Rock. He also does research in machine learning and develops new music technologies.

Here are some open source projects that Peter has written:

Wavechild 670 (GPL license)
A wave digital filter-based emulation of a famous stereo tube limiter from the 1950's.

Turn-taking measurement tools (BSD-style license)
Tools for measuring the quantity of turn-taking present in the behaviour of a group of agents.