| Your computer might provide volume control as part of its hardware
| function. You can control the volume with the volume control knob.
| If your computer does not have a volume control knob, however, you
| control volume by pressing the PgUp ( ) or PgDn ( ) key.
| Note: The value you set with the volume control knob or Fn + PgUp
| or PgDn key combination is the maximum or minimum value
| of the volume.
  Chapter 2. Using Audio and Modem Features 11