First off, I know a lot of people on this board got some some misconception that audio is not engineering and everything sounds the same due to many of Dave's comments on the subject. If you feel this way, feel free to skip this thread.
Anyway, there is a lot of interesting engineering associated with audio. Personally I wanted to do some measurements on a couple of amplifiers using the software supplied with my Digilent Analog Discovery unit, but I really find it somewhat limited for this purpose, sure it will do most measurements, but it's very time consuming and the supplied software is a little buggy, not always showing the truth.
I am aware using a PC soundcard is an option (even up to 24 bits/low bandwidth) but I find the sound card option being somewhat limited as you don't know what level you are testing at and often very fiddly to configure.
The Analog Discovery is "only" 14 bits, so limited on the dynamic range, but on the positive side it's got up to ~10MHz+ bandwidth. Anyway, as I got some experience with the API from other projects, I have decided to write some dedicated software for this purpose.
Primary purpose is amplifier measurements.