I have played with Pure Data before -- and was actually trying to remember the name, when I was writing a comment yesterday in response to someone wanting to visualize some audio they were producing, if you're just asking whether anyone here has touched it. I haven't done so in some time -- I don't do much audio stuff, and it was more from interest in software synthesizers than in live-performance enabling stuff. I don't know how much I could contribute to a discussion on Pure Data, but I'd probably read it.

I can't imagine that people would object to more vaguely-on-topic content on pretty much any community on the Threadiverse -- I mean, I'm pretty sure that almost all communities are presently constrained by content. Few are seeing so much that they have to specialize further. This one is getting a couple posts a week.