Yes, it uses a special chip that adds 8 channels of wavetable synthesis, which is quite significant, particularly in the right hands. Sadly, it was not used to its full potential in commercial games due to other constraints, but there are some pretty awesome examples of its usage by hobbyist musicians.
Thanks for the technical explanation! I knew it sounded more sophisticated! And thanks for the hobbyist examples, they're great. That second example sounds like it came straight from an unreleased Castlevania; is it yours?