The ESP manual says not to use the Palm sound called “Alarm” for experiments. Why not?
The Alarm sound has a longer duration than the others. If you set the setting “Seconds Between Beeps” to be too short (shorter than the duration of Alarm), then as the Alarm sound rings, it will overlap itself, with the next beep beginning before the previous one has ended. This can interfere with the timing of your experiment. Therefore, if you use Alarm, make sure that “Seconds Between Beeps” is longer than the duration of the Alarm sound, and test it carefully.