Buggy
If you lock up the app just close it down and start fresh. Drag the audio file in. It will automatically highlight everything you don’t want to keep. You can select ‘Save Unselected Area’ and just save it like that. If you rather adust the highlighted portion, it is really tricky at first. You need to grab from the far left gray side and the far right gray side. You can also drag from the gray to recenter the highlight.
Again, if pressing the ‘Play full thing’ button twice will lock you up. Dragging a second file will lock you up. It’s buggy.
I’d get my money back if I could. Just found out that if you press CMD+T in QuickTime you can trim audio from there.
Randroid88 about Easy Audio Trim