Thanks for the warm words, cebolao!
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is the PI plugin a "big brother" of AUTO-ALIGN?
Not really. Although both Auto-Align and Pi fix and improve phase correlation, the phase issues they resolve is an outcome of different situations and the technique used to fix those problems is different as well.
Auto-Align is designed to fix the comb filter effect created by summing multi-mic recording of a single instrument.
When mics placed at different positions to the source, you get the same sound (plus room reflections etc.) in both mics, but with a small amount of delay between them because the speed of sound. If the source sound was a simple sine wave, you could say that the delay is equal to a certain degree of phase shift, where the amount of the shift is frequency dependent. Now, if you think of an instrument as a combination of multiple sine-waves at different frequencies, the same delay amount will be equal to a different phase shift for every frequency! Therefore, the best way to fix it would be to analyze and measure the distance/delay between the mic and compensate for it , which is what Auto-Align does.
Pi is designed to minimize overlapping frequency cancellation between instruments in the mix.
Lets say the fundamental frequency of your kick is 65Hz and the song you're mixing is in the key of C (C2's fundamental frequency is about 65Hz), when the bass player will hit that C2 note along with the kick, there's a good chance that they'll cancel each-other's fundamental frequency if their phase at a given moment is not, well, in phase... a fixed phase rotator is not going to help in this case due to the dynamic nature of the situation. Sometimes, the bass/kick will be in phase, some other times they may be partially out of phase. Because Pi is a dynamic phase rotator, it'll "listen" to the kick and bass and constantly rotate their phase to minimize those cancellations.
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second - did you think about a postproduction workflow?
Yes, we did

We're planning on developing a dynamic Auto-Align. Right now, folks have been successfully using Auto-Align and bouncing sections as they go.
Happy Holidays!
-Nir