Polarity doesn't have to be fixed, and with the right tools, you can change the polarity of a recording after the fact - see for example, PolarDesigner: https:

Polarity doesn't have to be fixed, and with the right tools, you can change the polarity of a recording after the fact - see for example, PolarDesigner: https://github.com/austrianaudiogmbh/polardesigner https://github.com/austrianaudiogmbh/polardesigner (Disclaimer: I work on this product at AA.) Some of our users live by this plugin, it is such as time-saver for them in sessions. Things like being able to record a guitar/vocalist with a single microphone and then adjusting the polarity after the fact to get each independent channel sounding just right. Whats most interesting to me is that the technique used in PolarDesigner can be applied to any dual-diaphragm capsule microphone, assuming you know a few co-efficients that can be plugged into the open source of our plugin .. but of course, you'll get the best results out of the box with an OC818..