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Noisy Playback with USB Amplifier In 6-Channel Mode

Article ID:284714
Last Review:September 28, 2004
This article was previously published under Q284714
If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware:


When you use the Yamaha AP-U70 Universal Serial Bus (USB) amplifier in 6-channel mode in Windows Millennium Edition (Me), extraneous noise may be played when you attempt to play sounds.


Windows may attempt to transfer data to the Universal Host Controller Interface (UHCI) hardware on non-physically contiguous memory pages, which it cannot properly deal with.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:
   Date      Time      Version      Size     File name
   1/5/2001  8:52:39pm  147,840  Kmixer.sys
   1/5/2001  8:52:40pm   24,496  Rt.sys
   1/5/2001  8:52:40pm 4.90.3001.0   51,344  Usbaudio.sys
   1/5/2001  8:52:40pm  100,208  Wdmaud.sys


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


For additional information about Windows Me hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:
295413 General Information About Windows Millennium Edition Hotfixes

Microsoft Windows Millennium Edition
kbfix kbqfe kbhardware kbprb kbsound KB284714

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