No info on this specific one, but OPTi 929 cards tend to be pretty trouble-free. I'd just fire up Unisound and feed it default SB settings (A220 I5 D1 T4 P330) and see what happens. Most likely the QS501 wavetable is connected to the single MPU-401 interface of the card, so won't need any special init; if you tell software to send GM to 330, it should just work.
Can't recall ever having heard this one. It's a very early AdMos desing without much integration, hence the big pile of chips between the OPL3 and the IDE connector- a daughterboard (pics here with the same chipset also has seven discrete chips. Later AdMos designs were far more integrated, with just one chip and ROM. Not a huge fan of the sound, but with enough (2MB) ROM it could be half decent. Unfortunately AdMos seems to have re-labled the Macronix ROM chips, so I can't figure out how much there is. If it's 512kB you'll know soon enough 😉