

Most aren’t no, but the thing with synth nerds is that if they want a specific sound, they’ll dive through a flaming hoop wearing a barbed wire straitjacket to make it happen.
There are 100% a few people people fucking around with old ISA cards for musical purposes
Sound fonts are effectively sample banks, a lot of earlier soundcards are basically full synthesisers just without a control panel or keys.
There will be various elements of how the operators and effects work or any nonlinearity introduced by the circuits that will not necessarily be reflected in a sound font