Feature request: Gradient colors

It would be nice to specify and outer color and a center color to display the waveform with a gradient color.

Feel free to contact me directly if this is something you need.

The other option is to generate waveform data files and do the render yourself.

hey @chrisn

We'd like you to implement this. Please reach out to first part of my username @transloadit.com via email if you are interested in building this for us. Thanks!