When trying to create high-quality sound, you need to consider the
following factors:

   *  Waveform transitions.
   *  Sampling rate.
   *  Efficiency.
   *  Noise reduction.
   *  Avoidance of aliasing distortion.
   *  Limitations of the low pass filter.

 Making Waveform Transitions      Noise Reduction 
 Sampling Rate                    Aliasing Distortion 
 Efficiency                       Low-Pass Filter