This is a video demo of the Roland Juno-106 synth’s unison mode.
This synth dates all the way back to 1984, as does my inner adolescent as I attempt to explain the very first trick I ever learned on a synthesizer: How to enter unison, or monophonic (solo) mode.
My synth sounds like crap in this mode. Maybe yours sounds better? Watch and pretend that learning is fun!