Some more keyboard volume tips:
- To move the volume up or down in tiny steps, hold down Shift and Option when you tap the volume keys, this will move the volume in quarter steps. (Possibly this is Leopard 10.5 only, I can't remember it in Tiger 10.4).
- To silence the volume feedback "blips" noises which trigger at each step, hold down the shift key when adjusting the volume. The noises can also be turned off completely on the Preferences Sound controls window, uncheck "Play sound effects"