[http://puredata.info/%|%Puredata%|%] is the open-source little brother to MAX/MSP, and provides a graphical ([Flow-based programming]) environment to create programs which work on streams -- originally targetted for audio but now also visuals. Used for some very interesting experimental music and VJ projects. PD's subtitle is "The diagram is the program", representing the philosophy that the visual presentation contains the complete program -- nothing is hidden. Relevant to Tcl because the GUI is written in Tcl/Tk. I don't know of any efforts to create plugins in Tcl, but would be interested if anyone stumbles across one. There is now '''tclpd''', which allows you to write native Pd objects in Tcl. Another older (?) website: http://msp.ucsd.edu/software.html <> Music