Microsoft KB Archive/839562

= FIX: Audio playback includes unwanted noises for a multimedia application =

Article ID: 839562

Article Last Modified on 6/2/2006

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APPLIES TO

 Microsoft Platform Software Development Kit-January 2000 Edition, when used with:  Microsoft Windows XP Professional

 Microsoft Windows XP Embedded 

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Notice
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
After you create a multimedia application that makes frequent calls to the mixerSetControlDetails function, you may notice that the resultant audio stream includes unwanted noises. For example, you may hear short popping or clicking noises.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

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 hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name --  24-Mar-2004  22:10  5.1.2600.1366   1,897,472  Ntkrnlmp.exe 24-Mar-2004 22:11  5.1.2600.1366   1,953,280  Ntkrnlpa.exe 24-Mar-2004 22:11  5.1.2600.1366   1,925,632  Ntkrpamp.exe 25-Mar-2004 00:54  5.1.2600.1366   2,049,408  Ntoskrnl.exe

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

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MORE INFORMATION
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

After you install the update, you can change the frequency of the registry flush. To do this, follow these steps: <ol> Start Registry Editor.</li> Locate and then click the following key in the registry:

</li> On the Edit menu, click Add Key, and then add the following registry value:

Key Name: Configuration Manager

</li> Click the Configuration Manager key.</li> On the Edit menu, click Add Value, and then add the following registry value:

Value name: RegistryLazyFlushInterval

Data type: REG_DWORD

Radix: Decimal

Value data:  of the frequency that you want the registry flush to occur. The default value is 5.

</li> Quit Registry Editor.</li></ol>

Keywords: kbbug kbfix kbqfe kbwinxpsp2fix kbwinxppresp2fix kbhotfixserver KB839562

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