I've been experimenting using 2 amps but seldom in a stereo rig...I'll run one dirty one cleanish, or one highs and one lows, one dry one wet.
Angling the speaker cabs for intentional phasing results is like a new tool I'm learning to use. But sometimes I'll use 2 amps in 1 cab.
It also encourages use of amps as effects, dialing each one into its sweet spot and milking that response while getting them to mix well...or not.
Sometimes I want as much dissonance as I can get
Stacking fuzz sounds in parallel is also the shiz.
A Muff tuned low in 1ch and a bright fuzz like a Tonebender tuned high...alternating modulation between them or messing with polyrhythms.
Splitting delay and reverbs with or without fuzz in front (or after) is revelatory when you find that kickass combination, mono or stereo.
