Audio I/O Demo 2 -- Recording and playing back microphone input
==================================================================================

This demo records in real-time the audio from the microphone and plays it with a given delay (the minimum possible 
delay being 1 ms at 48 000 Samples per seconds (48 kSPS) or 0.5 ms at 96 kSPS). The minimum delay
possible is defined by 2 audio samples.

.. Note::
    You can only play audio on the full version of a device; the lite version does not have audio playback capabilities. 

This demo is done in precise steps:

    - Compute feedback delay
    - Configure audio acquisition
    
``Datapixx('SetMicrophoneSource', 1, 100);`` Here the ``1`` is the source of the audio input: 1 signifies microphone, 2 would be Audio In. The 100 is the gain for the microphone,
which is always a value between 1 and 1000.
    
    - Configure record buffer
    
 ``Datapixx('SetMicrophoneSchedule', 0, sampleRate, 0, 3, 0, 20e6);`` No delay on the Microphone Schedule (first zero), we sample at ``sampleRate``, 2nd zero
 zero signifies we are continuously acquiring data, the 3 signifies we are in stereo mode, the third zero is the base address we will use for this and, we will
 use a 20 megabytes buffer (``20e6``)
    
    - Set up audio playback schedule
    
    ``Datapixx('SetAudioSchedule', feedbackDelay, sampleRate, 0, 3, 0, 20e6);`` Here, instead of zero we have a ``feedbackDelay`` as explained before. We start
    at the same place as the Microphone schedule such that we playback the same audio that was recorded with the microphone, in the same mode.
    
    - Start record and playback schedules at the same time, but playback has the feedback delay before it starts.


.. literalinclude:: ../DatapixxToolbox/DatapixxDemos/DatapixxAudioFeedbackDemo.m
   :language: matlab
   :emphasize-lines: 32, 60, 65, 70, 71
   :linenos: