Microsoft KB Archive/828536

= Incorrect or No Playback on a USB MIDI Device =

Article ID: 828536

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft Windows XP Professional

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SYMPTOMS
When you use a USB MIDI device, if the sample MIDI data input packet is larger than 256 bytes, you may experience incorrect playback or no playback at all.



CAUSE
This problem may occur if either of the following conditions is true:
 * The output MIDI data packets and the input MIDI packets are different sizes.

-or-
 * The sample MIDI data input packet is larger than 256 bytes.

The Usbaudio.sys driver expects that the output MIDI data packets are the same size as the input MIDI packets and cannot process data packets that are larger than 256 bytes.



RESOLUTION
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

This problem was first corrected in Microsoft Windows XP Service Pack 1.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.

Additional query words: WinXP

Keywords: kbbug kbfix KB828536

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