what is it? : ChucK is a new audio programming language for real-time synthesis, composition, and performance, which runs on commodity operating systems. ChucK natively supports concurrency, multiple, simultaneous, dynamic control rates, and the ability to add, remove, and modify code, on-the-fly, while the program is running, without stopping or restarting. It offers composers and performers a powerful and flexible programming tool for building and experimenting with complex audio synthesis programs, and real-time interactive control.