The Amiga has four hardware audio channels - two of the channels produce
audio output from the left audio connector, and two from the right.  These
channels can be used in many ways. You can combine a right and a left
channel for stereo sound, use a single channel, or play a different sound
through each of the channels to create four-part harmony.

 about amiga audio 
 audio device commands and functions 
 device interface 
 a simple audio example 
 audio allocation and arbitration 
 allocation and arbitration commands 
 hardware control commands 
 double buffered sound example 
 additional information on the audio device