Could he be referring to MIDI using digitally sampled patch sets? In the early 90's, my
Gravis Ultrasound had onboard 30pin ram to load huge, high quality MIDI patch sets.
It hurts that I can't remember these details because back in that day, I was an ace with MIDI and MOD (and s3m, far, ult, xm, mtm, and all that). Maybe the Ultrasound used its 16 digital digital channels in combination with its Roland MPU401 and..... oh, I don't remember.
You could likely capture the sound card output as a WAV using some other software. If you have a Sound Blaster Audigy, it's built into the driver, giving you the "What U Hear" slider on the Windows Sound Controls recording side. Combine that "capture whatever the soundcard outputs" with an MP3 recorder like Messer, and you're set.
Regardless, if my motherboard still had ISA slots, I'd still be using that Gravis Ultrasound PnP with its whopping 4 meg of 30pin SIMMs. Come on, man, it 4 times more digital channels than the SB16, and it had MPU401 and AdLib emulation!