I am trying to build a stand-alone birdsong recognition platform that employs a github script I found, similarly to what Shazam does with songs. I purchased the audioinjector stereo soundcard for my raspberry pi3, I installed it and followed the great tutorial on github. However, while I hear sound from headphones connected through the jack, I haven't been able to test the microphone. I've tried with "arecord" following various youtube tutorials as well, but I haven't had any luck. I see clicking on the speaker icon in the desktop, top right, that audioinjector-pi-soundcard is both setup as audio outputs and audio inputs, so apparently it is installed. I have clicked (in Input Device Options) to enable Mic (capture) as I thought that would have allowed me to record through the built-in microphone, but it is not enough to actually allow me to record. 
Any help would be much appreciated. 

Thanks!