Trouble choosing notification sounds

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http://androidforums.com – Hi, I added a few MP3's from a sound site, however some only work as ringtones but will not work as notifications. I have the two folders- Ringtones, Notifications but there is no choice to "set as" notification" only Phone ringtone, Caller ringtone or Alarm tone. When I go thru settings/sound settings/notification ringtone they do show on the list, but even when chosen the last sound I had plays I have also tried restarting. Do some sounds simply not work well?. Thanks, Jeff (General)