Guess at load progress when total length is unavailable.
Add vertical margin for frame bars.
Make loading indicator a simple progress bar.
Show full loading bar after transfer completes.
Option to resize canvas to fill parent element.
Add option to resize canvas to meet a minimum time resolution.
Add option to auto-scroll parent during playback.
Smooth re-centering of scroll position.
Support for general position markers.
Use a more intuitive 'progress approximate' approach.
Restore original loading indicator, and make the continuous progress bar an option.
Make default marker appearance more subtle.
Stop playback and reset position when audio completes.
Add methods to seek and create marks.
Make default skip length configurable.
Make individual markers customizable.