I dont even know if this is possible but a thought came to me.... I really like when I hear mixes that feel three dimensional, like to where it's not just a flat plane where the usual drums, bass and vocals are centered, guitars, keys panned left and right etc, but to where there's a more forward to back separation too. I know some techniques are used like reverb delay and eq, but I was wondering if you could use surround plugins to say, move the vocals slightly forward or even put a Synth slightly behind you. While still having a stereo mix. I'm thinking subtlety, I know too much might mess up the mix and of course I'd want it to still translate well I'm mono. I've never messed with surround anything, so I don't know where to start of it this idea will even work , what do u think?