HTC Thunderbolt Manuel D’Utilisation

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Photos, videos, and music  7
Trimming an MP3 ringtone
The Music app has a built-in ringtone trimmer. You can trim an MP 
song and set a part of it as your ringtone.
1.  On the Playback screen, press MENU, and then tap More > Set as 
ringtone > Trim the ringtone.
2.  Use the onscreen controls to trim your ringtone.
1
4
5
1 
Trim sliders
  Left button
  Right button
4  Play/Pause button
5  Markers. (These show where the ringtone starts and ends.)