High Seas Havoc isn't SMPS - it's a custom sound driver by Data East.
SMPS was used in Gamtec's earlier games, including Squirrel King and Lion King 2. (In fact, the SMPS code is specifically ripped from Wonder Boy III-- there's a telltale sound effect in both those games.) I believe it's also used in VF vs. Tekken 2.
Edit: And yes, Mulan, both Pocket Monsters, and Hercules all use the High Seas Havoc driver. Most of the fighting games do too, but I seem to recall one or two odd ones out that used SMPS (I'll have to check which.)