Aha! That is the info I was looking for. I seldom do this, but it looks like you are saying that one remote, set to FOH rights has the FOH solo bus and another remote, set to MON rights, has the MON solo bus. I am usually "alone" on the remotes, so this hasn't come up for me, but I am glad I understand it now.

I just thought of how I could use this. Our guitar player has a remote on stage that would normally just be his monitor mix, but he could have the MON rights and MON solo bus, and he would hear his mix as long as he was focused on that, but could hear and adjust other musician's IEM mixes by switching momentarily to those. Sine he is the only one with a remote on stage, he is frequently asked to adjust someone else's mix.