![]() If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. ![]() If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. This hotfix might receive additional testing. Apply this hotfix only to systems that are experiencing the problem described in this article. However, this hotfix is intended to correct only the problem that is described in this article. Hotfix informationĪ supported hotfix is available from Microsoft. After you apply this hotfix, the limitation is changed to 512 bytes. To resolve this issue, install this hotfix on the affected computers. If a high-speed audio device requests over 256 bytes, the device does not work correctly. This issue occurs because the USB Audio driver (Usbaudio.sys) has a hard-coded size limitation of 256 bytes for a MIDI packet. Additionally, the MIDI ports may not appear or not work as expected if you use software that supports the MIDI protocol. In this scenario, the USB audio device may not work correctly. The USB 2.0 audio device has a MIDI out port. You attach a USB 2.0 audio device to a computer that is running Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2. Windows Vista Windows 7 Windows Server 2008 Windows Server 2008 R2 More.
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