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Apr 20, 2015 10:56 AM in response to baptistevoby Computerix2,Hi,
here is a solution that is working for me in 10.9.5 (thanks to Wakko from http://iszene.com/thread-165772-post-1927711.html#pid1927711)
- (Make TimeMachine backup)
- Quit calendars
- Go to ~/Library/Calendars. Here, for each calendar there is a folder with its UUID (i. e. 9C36543C-8BA1-4264-8E3F-C1BB9FB207BE.calendar). To find out what calendar it is referring to open info.plist within it. Chose the calendar's folder you want to change the alarm sound for. It should also be containging the folder /LocalDefaultAlarms with the two files EventAllDayAlarms.icsalarm and EventTimedAlarms.icsalarm. If it does not open calendars and create a test event in that calendar. Go to 2.
- Open EventAllDayAlarms.icsalarm and EventTimedAlarms.icsalarm. Find the line ATTACH;VALUE=URI:basso and change basso to the sound you like. I had to place the sound file in /System/Library/Sounds.
- (By the way: If you want to change the default hour for alerts for all day events, change TRIGGER:-PT15H accordingly. PT stands for pacific time, -PT15H means 9 AM (15 hours before beginning of the day).)
- Reboot
EventAllDayAlarms.icsalarm and EventTimedAlarms.icsalarm are re-created and reset to basso each time calendar prefs are saved. So, in order to prevent overwriting your manual settings accidentally, set them to read only.
Good luck!
Florian