So you’re not looking for an audio editor, but rather live recording software that supports multiple simultaneous inputs? The more specific your request for help is, the better suggestions you’ll get.

What features is Audacity missing for your needs?

Is dupeGuru what you’re looking for?

dupeGuru is a tool to find duplicate files on your computer. It can scan either filenames or contents. The filename scan features a fuzzy matching algorithm that can find duplicate filenames even when they are not exactly the same. dupeGuru runs on Mac OS X and Linux.

dupeGuru is good with pictures. It has a special Picture mode that can scan pictures fuzzily, allowing you to find pictures that are similar, but not exactly the same