To Save you looking for a Waveform Editor app, here is a Hype Template that will display your Audio file in a waveform to use with @JimScott Tip.
It also has a play/pause button and a reload button.
The reload button can be used as the name implies but also if you change the size of the browser window you can use it to re scale the waveform to fit.
The Audio file is referenced with a Global var in the Head
waveform.hypetemplate.zip (1.4 MB)