Ah yes, the BSMT2000 sound. This was the era when everything "hi-fi" had their own "cool" sound, apparently following the THX sound system's footsteps.

BSMT2000 was the sound chip used in a lot of 90s and early 00s Data-East, Sega and Stern pins (and in some vids too!). Its presense was often advertised just as passionately as the "Digital Stereo" in earlier games.

Technically it's a DSP chip (TI TMS320C15) with custom firmware. It was designed by Brian Schmidt and the name comes from "Brian Schmidt's Mouse Trap" and 2000 apparently because 2000 was cool.

Here's the BSMT2000 sound and a pin advertising it in all its glory.