[TV] OSW [http://osw.sourceforge.net] is I think a Univ. of Berkeley project to make musical instruments with blocks, which uses Tcl/Tk as interface.

It uses a multi-threaded version of [Tcl].

(screendump of opening screen:)
[http://82.171.148.176/Diary/Ldi70/srcopens1.jpg]

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