Your system's way of controlling where sounds will be played, and how loud.
On Windows, double-click the loudspeaker icon in the Start bar. On MacOS X, go to System Preferences, then to Sound, then to Output Volume (you can put a loudspeaker icon in OSX's menu bar here). On HP-UX, try the Use internal loudspeaker... preference in Praat's Preferences menu.
© ppgb, August 22, 2005