Yup, it's actually really common to see sound cards used a o-scopes with just a tiny bit of input leveling. Sadly the sampling frequency is pretty low and lack

Yup, it's actually really common to see sound cards used a o-scopes with just a tiny bit of input leveling. Sadly the sampling frequency is pretty low and lack of triggers make it not very applicable. This domain is really where CPLDs and FPGAs shine.