x_loudness

An integer indicating the loudness of the beep. It ranges from -100 (silence) to 100 (full volume).

The default is zero, which means the beep is at the system default loudness. The absolute value of a negative number is the percentage from the system default loudness toward silence, and a positive number is the percentage from the system default loudness toward full volume. The amount of loudness control is system dependent. For example, Sun systems have the same volume for values -99 through 100, but other systems may have a wide range of volume.