PLAYTRAK [START] [END] [CHANNEL] [DEVICE]

This routine will play an audio CD as defined by the tracks.  A 
compact disc can hold up to 99 tracks but the program will only 
allow you to define up to the number of tracks on the disc.

      Start   - First track to commence playing audio
                  ( default = 1 )
        End   - last track to play ( default = start track )
    Channel   - determines which output channels are active
                      S = stereo ( default )
                      L = left channel         
                      R = right channel        
                      M = mute                 
     Device   - CDROM device name (default first drive)
                 or CDROM drive letter