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