Suggestion for mono playback

I would like to hear mono recordings (fold down included) processed as a true mono signal with “mono punch” instead of fake stereo. It would be extremely cool if this process can play narrow stereo to simulate small venue and wide stereo for arenas & stadiums. Added bonus toggle key for stereo processing and led indicator (lower left on player) mono <-stereo-> ->stereo<- (mono, wide stere, narrow stereo)