Chart: Backfilling Complete Notification

When a chart is busy backfilling data, I would like to get some sort of audio notification when it has completed collecting the data (and potentially completed calculating any studies, etc). Because such calculations and backfilling can be done more often, and audio responses for such could be distracting, I recommend using simple tones or sounds (customizable by user?) or mp3 file referred by user(?) to indicate when the backfilling or calculation is complete.

This would be helpful to those who are working on other charts or other applications and would like notification when a requested task to multicharts is complete.