Totally off-topic post today.
I was looking for a quick and easy way of trimming an MP3 yesterday on my Mac (yes, I use a Mac for SharePoint dev) and stumbled across a free way of doing this with QuickTime.
Open the sound file you want to trim in QuickTime and then press Ctrl+T (or Cmd-T on the Mac) and you’re able to mark the segment you want to trim, then just save the new version, et voilĂ .