stk: stk - Synthesis ToolKit stk: stk: The Synthesis ToolKit in C++ (STK) is a set of open source stk: audio signal processing and algorithmic synthesis classes stk: written in the C++ programming language. STK was designed to stk: facilitate rapid development of music synthesis and audio stk: processing software, with an emphasis on cross-platform stk: functionality, realtime control, ease of use, and educational stk: example code. stk: stk: