I've been running Arch for almost a year now, and my audio was working great until I started messing around with things (>.>)  The reason I started messing around with things is because I want to get audio support working in Skype, which I was able to hear the sound effects Skype makes, but was unable to to use the microphone.  On a side note, my hardware is a MBPr late 2013.So I decided to open Volume Control and check out the configuration options.  Under the configuratoin tab in the Volume Control app I have two devices I can configure.  I can configure the HDMI device or the Bult-in Audio.Now this brings me to my first question, which Built-in Audio configuration option should I choose?  I obviously want to be able to use the built-in microphone along with the speakers, so I chose, Analog Surrond Output 2.1 + Analog Stereo Input.However, all the options I can choose from are the following,Analog Stereo Duplex Analog Stereo OutputDigital Stereo (IEC958)    Output + Analog Stereo InputDigital Stereo (IEC958) OutputAnalog    Surround 2.1 Output + Analog Stereo InputAnalog Surround 2.1 OutputAnalog Surround 4.0 Output + Analog Stereo InputAnalog Surround 4.0    Output Analog Stereo InputWhen I have this option selected or any option selected for that matter I can no longer hear any audio coming from the speakers.When I open alsamixer it states the audio device as being pulseaduio, and the Master Front doesn't appear to be muted.Also, I can't hear anything running speaker-test.Any help on how I can troubleshoot my audio situation would be greatly appreciated. 
How to troubleshoot audio problems / issues in Arch?
arch linux;alsa;pulseaudio
The problem was rather simple, I needed to select Analog Stereo Duplex to get the mic and speakers working for things like Skype calls. 