levinite wrote:

Set all active microphone pans to 0 yet still see left and right changes in "mixed output"? Could someone please explain.

This may happen if you have some delays on the mics. Those delays are displayed just below the L and R letters in each mic section. Right click on it will allow you to enter other values. Put 0 everywhere and you should have everything centered (if all pans are set to 0).

Thank you for clearing that up, I guess I didn't expect the delays to have this effect but they do as they should.

Set all active microphone pans to 0 yet still see left and right changes in "mixed output"? Could someone please explain.

This may happen if you have some delays on the mics. Those delays are displayed just below the L and R letters in each mic section. Right click on it will allow you to enter other values. Put 0 everywhere and you should have everything centered (if all pans are set to 0).

Edit:
Title, since this only seems to apply to Pianoteq 9.
This seems to be a bug but I can't say. As far as I know, Pianoteq 8 did not do panning per microphone.