New sound scheme for World Clock:
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If you want to add new sound scheme for World Clock, copy wav files here.
Files must have following names:

time0.wav     Full hour
time1.wav     15 minutes
time2.wav     30 minutes
time3.wav     45 minutes
timeh.wav     hour chime

Open 'Settings' notebook, go to 'Events' page, 'Sounds' section and
select 'MySound' item in the list. Press 'Save' button to save changes.
