Sound input for No$GBA on Mac

I have a Wineskin wrapped No$GBA 2.6a to use on my Macbook Air running El Capitan. I haven't been able to use the mic for No$GBA in Mac as it's not taking in any sort of voice input through the built-in mic. So far all the solutions I found were for Windows. I tried both Audacity and Soundflower but no luck.

For Audacity I can't find where I'm supposed to change the mic to - or I'm looking at the wrong drop-down menu entirely - it looks different on Mac. It only has the options of my built-in...

Sound input for No$GBA on Mac