Start running an audio acquisition schedule. The actual hardware schedule will
be initiated by the next RegWr* command, and then the audio inputs will acquire
their first sample after the scheduleOnset specified in SetMicrophoneSchedule.
Note that every call to StartMicrophoneSchedule must be preceeded by a call to
SetMicrophoneSchedule (ie: multiple calls to StartMicrophoneSchedule each
require their own call to SetMicrophoneSchedule)).
See DatapixxMicrophone*Demo and DatapixxAudioFeedbackDemo files for examples.