Polarity

In the old days, I had Puremusic on a Mac which enabled me to change polarity on the fly. Nowadays with my Innuos Zenith Mk3 I don’t have that function anymore and miss it since polarity in a resolving system has a significant impact on SQ. I have raised this with InnuOS and Nuno points out that the functionality exists AT STARTUP on the Squeezebox engine contained. That however isn’t useful since one can only establish polarity by listening on the fly. Does anybody have an idea on how to switch polarity in the digital domain?