Decompresses a chunk of compressed data produced by GetVoice().
nBytesWritten is set to the number of bytes written to pDestBuffer unless the return value is k_EVoiceResultBufferTooSmall.
In that case, nBytesWritten is set to the size of the buffer required to decompress the given
data. The suggested buffer size for the destination buffer is 22 kilobytes.
The output format of the data is 16-bit signed at the requested samples per second.
If you're upgrading from an older Steamworks API, you'll want to pass in 11025 to nDesiredSampleRate