I currently use Audacity's WASAPI feature to capture the audio being outputted by my PC's sound card. I am now, however, in need of a way to capture both audio output as well as microphone input on the same track. It doesn't look like this is possible in Audacity, and I don't want to open up 2 Audacity windows and record output in one and input in the other and then merge them (it would be hard to make the timing exact and even then, I don't know if that would work).
I like Audacity because it is easy to use and is portable (no admin rights required to install which is essential). Is there any lightweight utility I can use that would be able to capture both output and input simultaneously?