On a computer that is running Windows Vista, you perform an editing operation or a playback operation on a MIDI audio device. When you do this, you may notice timing jitter and clock drift.

This problem occurs if the following conditions are true:

• The MIDI device does not reside on the peripheral component interconnect (PCI) bus.
• The MIDI device does not advertise any audio endpoints.

On a computer that is running Windows Vista, you perform a capture operation on a MIDI audio device by using the Microsoft DirectMusic components. When you do this, the MIDI notes are played in the wrong order.

After you disconnect a MIDI device from a Windows Vista-based computer, ports for the device may still appear as available in a MIDI application.

You may experience one or more of the following symptoms on a Windows Vista-based computer when you use the Microsoft GS Wavetable Synthesizer.
Symptom 1
The GS Wavetable Synthesizer cannot play the following MIDI percussion instruments in the correct pitch:

• Timbale
• Agogo
• Woodblock

For example, the GS Wavetable Synthesizer plays the high note of the Timbale instrument in a low pitch.
Symptom 2
The GS Wavetable Synthesizer cannot play any tone after the GS Wavetable Synthesizer receives a BANK Select Message.