Pi causes pitch problem?!?


Hi all, I had a problem with Pi yesterday. It created audible pitch shifting effects. I mixed a simple jazz trio: 2 C12 in MS configuration for the main pair, plus spot mics for double bass, acoustic guitar, percussions and vocals. The pitching effect was particularly audible on guitar and bass, especially on long notes. It sounded to me as if I heard the GTR nicely blended through the MS pair and the spot mic, then one of the two was the shifted over time, therefore rubbing against the other signal’s pitch.
Has anyone come across this before? Any tips on how to avoid this?
I wasn’t able to use Pi, the pitching was just too audible unfortunately.

Thanks for your help!

Sunny greetings from ByronBay, Australia

Jan “Yarn” Muths