A real session: a mono piano recording (Chopin, public domain) with Shuffler on it. It starts bypassed, so you hear it as it went in, straight down the middle. Press play, then switch the plugin on and listen to it open up. Then tick Mono to hear that nothing falls apart when it's folded back to one speaker.
Both versions are bounces from Logic, the same session with the plugin on and bypassed, with the same light master on both. Gain Match keeps them at the same loudness, so you hear width, not volume.
Tick "Mono" to fold both versions to one speaker, the way a phone or a club system might. Folded to mono, this one lands within a decibel of the original across the whole spectrum: no hollow notches, no phasing.
Shuffler comes with a 7-day free trial, everything working. Put it on any track or bus, mono or stereo.