I used to run it's audio output through my SW60XG's line-in, which for some reason added reverb to it. OPL with reverb actually sounds pretty good.

BTW, if you get a chance, I'd love to hear some Dune II recordings of it.
I installed the card in one of my systems (next to a GUS Ace & SCC-1) but it wasn't very stable. Every now and then when I was playing those RL2 files it just hung up my system. Have to test it in an older system as stand-alone card later.
Anyway, although Dune II claims support for Adlib Gold in the selection list of soundcards there is absolutely no difference in music as one would choose regular Adlib.
Still have to try Dune but that game wouldn't run at all on that particular system.