Inside Macintosh: Sound /

Chapter 2 - Sound Manager / Sound Manager Reference

Sound Manager Routines / Controlling Volume Levels

SetSysBeepVolume

You can use the SetSysBeepVolume function to set the current volume of the system alert sound.

FUNCTION SetSysBeepVolume (level: LongInt): OSErr;

level

The desired volume level of the system alert sound.

DESCRIPTION

The SetSysBeepVolume function sets the current volume level of the system alert sound. The values you can specify in the high and low words of the level parameter range from 0 (silence) to $0100 (full volume). Any calls to the SysBeep procedure use the volume set by the most recent call to SetSysBeepVolume.

SPECIAL CONSIDERATIONS

The SetSysBeepVolume function is available only in versions 3.0 and later of the Sound Manager. You can call this function at interrupt time.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SetSysBeepVolume function are

Trap macro	Selector
_SoundDispatch	$02280024

RESULT CODES

noErr

0

No error