Not sure what others have done to get around the PO limitation of being locked in the key of C, but I have found the Soundtoys Little Alterboy to be an excellent tool to address this. I use Ableton and just throw the Little Alterboy on my PO tracks and change to the key needed (with Pitch and Formant linked on the Little Alterboy, and in Transpose mode). There is seriously very little sound quality lost. I almost can’t even tell the difference. It rules.
Maybe one of the PO XA/XB will introduce a neat pitch shifter
They were talking about voice thing…