Cleanup, make the default sampling rate 48000 for NON-VCD use . Change -V to
reflect the VCD2.0 specs which allow mono at 64, 96 and 192 kbit/sec and stereo
at 128, 192,224 and 384 kbit/sec. -V sets the sampling rate to 44100 and
validates the bitrate against the number of output channels requested (stereo
by default).
