RTcmix is a complete sound synthesis and signal processing language, including a robust scheduler and large set of pre-compiled instruments. The rtcmix~ object completely encapsulates RTcmix within Pd, extending the capabilities of Pd.
Features of the rtcmix~ external include:
RTcmix is a text-based open-source digital signal processing and sound synthesis language. RTcmix is derived from the original CMIX language developed at Princeton University by Paul Lansky, with real time support developed by Brad Garton, Doug Scott, Dave Topper, John Gibson, and many others.
Full documentation and information can be found at http://rtcmix.org.