It seems the 2soniq and such cards are not to be found anymore, but does anyone have a stereo card for the IIgs, or a link to proper docs/schmetaics?
Willing to buy a card if someone has one :) (And willing to do a bunch of soldering if someone doesn't....)
By sheer luck/chance I just got a notice from Console5 that these were back in stock! Mission accomplished!
https://console5.com/store/darksound-apple-iigs-stereo-sound-card-and-digitizer-w-amplifier-line-out-2gs.html