[$] An introduction to Linux audio plugin APIs

The world of music and audio production is largely dominated by
proprietary software vendors. Among them, and under the
GPLv3 license, the way the company exercises its control over the SDK
keeps pushing developers away toward other open-source solutions.

This is an introduction to open-source plugin
APIs for musicians and sound engineers alike. It focuses on the options in
the larger ecosystem and how their shortcomings led to the creation of new
alternatives with liberal licensing.