Everytime I try to make call with Skype or Google Hangouts from my MacBook Air, the embedded internal microphone volume is too low. I am sure it is working, because when I shout loudly enough, the people on the other side of call can hear me, but only really quietly.
I have Macbook Air 13'' late 2010, right now running OS X Yosemite 10.10.5, but I had this problem since the very beginning.
I have played with volume and also input volume levels in Settings → Sound, volume is on maximum level, but still unusable. I have Googled for the problem and tried several workarounds, none seems to be addressing my issue/working for me.