External Microphone Volume

I own the Klipsch R6M headphones and the built in microphone is very low. Nobody can hear me unless I yell or press the microphone hole up to my lips. This does not occur in any other Android device I plug it into. I figured I'd grab AlsaMixer and boost the external microphone input but I am unable to figure out which option is the right one. Does anyone know? Either that or does anyone know how I would go about boosting the external microphone input volume another way? I'm desperate here. Thank you in advance for the help.

Optipop 5.1.1 Build June 29th 2015