This is definitely a feature request on our radar. Some enterprising users on our forums have found ways to show a waveform while editing. I found this one from @JimScott but I feel like there might be some others:
One important caveat to note is that using a <video> or <audio> tag might not be an exact sync; you can use it in the editor but it will probably work out better if the actual audio comes from using Hype's built-in audio as this uses lower latency Web Audio API when available.
(Also note that autoplay of audio in browsers has pretty much gone the way of the dodo bird)