A MIDI capture program does not work correctly on a Windows XP-based computer that has a dual-core or hyper-threading processor (919484)


The information in this article applies to:

  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition

SYMPTOMS

You use a Musical Instrument Digital Interface (MIDI) capture program on a Microsoft Windows XP-based computer. The computer has a dual-core or hyper-threading processor. However, the MIDI capture program does not work correctly. Specifically, the MIDI data is corrupted.

RESOLUTION

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 Windows XP 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.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.
File nameFile versionFile sizeDateTimePlatform
Usbaudio.sys5.1.2600.293759,39223-Jun-200609:05x86

WORKAROUND

To work around this problem, configure the dual-core or hyper-threading processor to use only one processor. To do this, add the /Numprocs switch to the Boot.ini file, and then apply a setting of 1. You can use the Microsoft System Configuration Utility to make this change.

Note This workaround may affect the computer's performance. You may want to use this switch only when you are using the MIDI capture program. In this situation, delete the switch when you are not using the MIDI capture program.

Add the /Numprocs switch

  1. Click Start, click Run, type msconfig, and then click OK.
  2. Click the BOOT.INI tab.
  3. Click Advanced Options.
  4. Click to select the /NUMPROC= check box, and then click 1 in the /NUMPROC= box.
  5. Click OK two times, and then restart the computer.
Note After you restart the computer, the System Configuration Utility (Msconfig.exe) also starts. To restore the computer to its previous state, use the "Delete the /Numprocs switch" method.

Delete the /Numprocs switch

  1. Click Start, click Run, type msconfig, and then click OK.
  2. Click the General tab.
  3. Click Normal Startup - load all device drivers and services.
  4. Click OK, and then restart the computer.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Modification Type:MajorLast Reviewed:7/13/2006
Keywords:kbWinXPsp3fix kbWinXPpreSP3fix kbHotfixServer kbQFE kbExpertiseBeginner KB919484 kbAudEndUser
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