Sound Channels:

  These 4 buttons are used to turn the amiga sound channels on or off. This
  is used when you want to accompany the module.
  (See the  .

  Please notice that these buttons indicate the  hardware  audio  channels,
  which  means  that  if  a  noteplayer  is playing, pressing the channel 1
  button can turn of upto 8 channels.

  Ofcourse they can be used for fun too!

  You can also use  to control this feature.

  NOTE: It's  not  all moduletypes which supports turning off channels e.g.
        the 7 channel TFMX-player. See the