Default sound
This is the sound which will be played if the sound specified in the alarm action
can't be found. If this sound doesn't exist either, the windows default sound
will be used.
Override sound volume
If you check the box, the system volume will temporarily be set to the specified
volume when the sound plays. Currently, this will only affect the 'WaveOut'
volume.
Voice
Here you can select the voice which speaks the alarm
message.
Override voice volume
If you check the box, the voice volume will be set to the specified volume
when the voice speaks.
Override voice speed
If you check the box, the voice speed will be set to the specified speed
when the voice speaks.