plugdata is a plugin and standalone wrapper around Pure Data. It aims to offer the same features as Pure Data, but in a DAW. It features an updated GUI that will make patching more comfortable. plugdata also ships with two large libraries of extra objects (ELSE and cyclone).
Pure Data is an interactive programming environment that allows you to process, synthesize and modify real-time audio signals. It also has a system for control messages. For more info on Pure Data see: puredata.info
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