Crashy

Yes, but Hilbert is an analytical integral of the signal, not a unique signal in itself. Hilbert doubles positive frequencies and cancels negative frequencies, so it is only useful to DETECT the 180° phase shift between L+R. It can either do this...

Keen to hear more about this. I'm still not ready to spend the $ buying a teensy and 3x audio boards, until I know it's going to do the job... I have downloaded DPL test files and viewed them using audacity. Also I have made hundreds of my own...