This is an adaptive (dynamic) audio buffer. It automatically detects the viewer's connection speed and adjusts the buffer to match - so that the audio plays as soon as possible and as smoothly as possible (meaning, there are no interruptions during the audio).
There are several features - just to demonstrate and compare, and can easily be removed. Progress bar and full text for total percentage of the buffer needed - connection speed - total filesize. Initial buffer percentage needed. Total percent of the file loaded. Remaining time left in the audio file (while it is playing) and a visual progress bar.
Comments are included on most objects in the file - just open the Script panel and read 'em !