|I agree with the general premise that the voice is usually central (effectively mono). However, I have run into some tracks where the singer was displaced to the right or left of center. In these instances a phase cancelling effect could go unnoticed - hence my suggestion that some audio would sound OK.|
My thinking was based on the days when I used to build amplifiers and used stereo record pickups. If you had a reversed channel at the pickup, then linked the channels at the amplifier by switching to mono [they had mono switches in those days] the singer sounded as if he/she was at the end of a very long tube.
In fact to this very day if I want to record an old 78 rpm record (lateral variations only) shorting the stereo pickup input will at least cancel the vertical hiss due to record wear or damage. I have a plug-in cable arrangement to do this. Vertical variations are only necessary for stereo records or some obscure and very ancient "hill and dale" records - including laterally tracked clockwork phonograph cylinders.
Always pop back and let us know the outcome - thanks