I'm trying to build a project that takes an audio input. I took the advice from this how-to and bought a cheap USB sound card. I'm pretty sure mine has only mono input, which is fine because the input is going to be from a record player, but you might need to look to a robust model or a dedicated microphone input device if you want higher quality sound.

The next thing I need to figure out is how to capture the audio source and decode it to a file that can be played back. That I haven't yet figured out.

I found a project idea on hackster.io that I'd like to try with Omega2. Basically, putting up lights on the underside of the kitchen cabinets, with a motion sensor and an ambient light sensor to control when the lights turn on and how bright they are. Not really sure what I'd need yet, I have the Omega2+ with the expansion dock.