Thank you for putting up those screen shots. On the next to the last screen shot, I do not get the "Trim the ringtone" line. It only shows the first two, Phone ringtone, Contact ringtone. Can't scroll to see it, it just ain't there.
No expert here. Didn't think one had to worry about file types. I've tried several songs with the same result; no Trim function.
I took a CD, Frank Sinatra's A Jolly Christmas Album, and ripped it to my computer using Windows Media Player. Then I looked at "The Christmas Waltz". The "Properties" on the file show it as a Windows Media Audio file (.wma). Then I copied the entire song to the Rezound by connecting the phone to the computer and dragging the file over according to the HTC instructions. The music (The Christmas Waltz) shows up and plays on the phone. I can set the entire song as a ringtone for either the phone or a contact, but it won't let me trim it. Does it have something to do with the file type? (.wma)?