Audio Volume Extension 1.1 is no longer needed on Power Macintosh/Performa 5200, 5300, 6200, and 6300 series computers running Mac OS 8 or later.
The Audio Volume Extension had a fix to allow the internal Global Village (Gold & Platinum) modems to play sound through the internal speaker. Additionally, there were some PrimeTime3 specific audio patches. All fixes were incorporated into Mac OS 8.