Here is a good start
http://www.bigbookofamigahardware.com/bboah/CategoryList.aspx?id=29The first one I remember was the perfect sound (remember wanting one)
I think this was out in the 1.2 era
Kinda of as an after though when they became cheaper
I bought a cheap one called megalosound.
I also build one off of plans on aminet and used it as a oscilloscope
Additionally
At the television production house I worked at in college, we had an ADC16