Also, if the product I'm testing is an external device I need a way to handle its audio as well.

This mixer meets all of these needs, works with both +4 and -10 signals, and has excellent audio characteristics in its line level paths.

I just like to use a good mic to get good voice audio into my computer

Still working well as of right now after a having had it for a few months.

Minor things but enough to annoy you as to why they did not design better