Juniper Allegro CE Owner's Manual page 105

To edit, add, or listen to a sound, make a selection from the list on the
left. The name of your selection is shown in the Sound box if a sound
is already associated with it. Otherwise, it says None.
Select Browse to find and select the desired sound WAV file that you
want associated with the selected action. To listen to the new sound
(or existing sound), press the right arrow button next to the Sound
box. Changes you make can be saved as a new sound Scheme or you
can choose an existing sound scheme from the drop down list.
Windows CE Page 4-45