added log messages for specifics of audio format

Ignore-this: c67a32c1d0f8ed8e302e466b91e06afc

darcs-hash:20140711050657-c21fe-39bdf72b9f7b9085e195a38451a6b1b5145ce6e6
uses sample rate of 8000 internally regardless of system

Ignore-this: f20252d20e0628c488f34208c8e8b7f0

Different systems have different sample rates for mic and speaker.
I decimate the audio from the mic to 8000 and inflate it to the sample rate of the speaker.

I still need to add a way to merge audio streams...

darcs-hash:20140711161724-c21fe-09cd6988ca3e6a462c4b9c984723aca3659084cc
removed asserts for performance reasons.

Ignore-this: 27fea88752a567111b30e2efd740e06e

darcs-hash:20140711162311-c21fe-4828d65ba98a7d228af185d02ee70136156743b2