CCS64 KNOWLEDGE BASE ARTICLE
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When using the Windows MCI WaveOut Sound Device, you can sometimes hear popping or crackling noises or the sound goes out-of-sync for a short period of time.
The Windows MCI WaveOut Sound Device, and indeed any Windows WaveOut-based sound driver, will cause popping or crackling noises to be heard and/or the sound to go out-of-sync, during periods of system activity; however, it provides for fast sound delivery.
If the popping or crackling noises heard are too frequent or are for too long a periods of time or if the sound goes out-of-sync too frequently with the Windows MCI WaveOut Sound Device, then use the Default Sound Device instead, which is the DirectX Sound Play-Back Device.
The Default Sound Device gives smoother sound delivery than the Windows MCI WaveOut Sound Device, but is more system-intensive.
This article is for information purposes only.