Hi Everyone.
I saw this thread come across and thought maybe you would be interested in the QS plugin that
Brett Buddin and
I made with a collective of engineers and artists through
dublab and supported in part by the
National Endowment for the Arts. This collective includes guidance and inspiration from Suzanne Ciani, Quad Bob Herndon, Odaka Shuichi, Richard Brice, Bernie Grundman, Beno May, Scott Sedillo and though we haven't quite figured out how to integrate Involve's flavor of QS yet, David and Charlie over there were especially helpful in us getting our head around the most important AES paper by Ryosuke Ito, Susumu Takahashi and Kouichi Hirano.
We call it
QUARK (Quadraphonic Universally Accessible Resource Kit). It's 100% free. It is made as Mac VST3, AU and AAX versions only. Tested in ProTools, Reaper and Ableton Live. I'm hoping to put up some instructional videos in the coming months since Quad creation workflows are pretty funky, especially in Ableton Live. Reaper has been helpful for the development and testing of the parameters of the plugin.
you can download it here:
QUARK
it encodes and decodes QS in realtime, developed for people to make new quad work for release but I'm sure that it will help for these other purposes too.
I'm very much seeped in another project of mine called PHONOCUT and can't do much technical support beyond what we have on the site. It's pretty self explanatory but like I said, I hope to make some videos soon. Thank you for the patience, if it takes me a while to reply via my website for any questions.