The OPL2 and 3 chips were all-digital, so it&#x27;s possible to verify that the bitstreams from the original chips matches the outputs of an emulator of the chip...but the original hardware also included some specific ADCs with some kind of buffer feedback loop, and I think that&#x27;s where the real difference in the sound comes in (like the overly-harsh drum sounds from most of the emulators).<p>I&#x27;m working on a side-project right now to build a USB-connected YMF262+YAC512 board for the reasons you&#x27;ve mentioned. I&#x27;ve actually got a 600MHz K6-3 with 128MB of RAM, Geforce4 ti4400 and SB16 that I use as a retro computer, but if I can have the same, proper audio output on my regular machines, that would be even better.