From a user standpoint, as long as you know what this control does and how to use it, all is fine. The Capn has a valid point, however. In terms of what this control does to the audio waveform," phase inverting" would be the most accurate description. The generally accepted end-user term has always been "polarity reverse" Throwing in a 3rd term of "phase reverse" tends to muddy the water a bit. I'm all for keeping things as simple as possible.