Changed:
    - stereoStreamFormat to non-interleaved audio channels and added it
      back to the AudioSetproperty of the output.

Still need to test these changes
Added:
    - Robustness to helper functions
Broken:
    - Needs stereo output but currently only works with in mono
    - Output voltage from reg is only reading 2.8 VDC instead of 3.3V
    - freeing bufferlist is now broken for some reason. Believe it has
      to do Process IO function
Added:
    - local buffer for input callback to fix free issue
    - 3.3 volts out working
Broken:
    - still using mono
Merge pull request #5 from mick31/event_callback

Event callback