can't you tell me in human language what the difference is?

It's a completely different codebase, with the same target of emulating opl2/3.

Where is the SB16 emulator?

There's none. There's an adlib (opl2) emulator, and searching the page for
words like "emulator" does wonders.

wd wrote:

can't you tell me in human language what the difference is?

It's a completely different codebase, with the same target of emulating opl2/3.

oh ok!
What's your personal opinion: do you think 'old', 'fast' or 'compat' is the best opl emulator, if you say your personal favorite one? I mean by looking at accuracy of the emulated sound.

Well they are all included for compatibility reasons so likely some are more accurate than others for different games.

fast is by far the preferrable as it's really fast.

Is fast noticeably less accurate?

Not that i know minus bugs.