Emulator

What steps will reproduce the problem?

1. Launch the game
2. Play a level

What is the expected output? What do you HEAR instead?
Expected: Smooth sound. Hearing crackling sound instead.

Dolphin version with the problem? Other Dolphin version without the
problem?
Tested with latest build: 5628

32-bit or 64-bit and any other build parameters?
Tested in 32 and 64 bit. Default parameters in VS2008, like I did with all
previous builds.

OS version and versions of tools/libraries used?
Windows 7 x64. Tested on 2 different hard drivers (both with Win 7 x64).

Please provide any additional information below.
The latests build I did without audio problems was 5474. In the early 55xx
builds, the issue was already here.
For those who don't trust me and think I am crazy, please hear the
attached recording (sorry, it's wma). Recorded from World 2-2.

Tested with OpenAL and DirectX => same issue. Tested with and without
audio throttle => same issue.
I don't think that it's my system or hardware, as there's no pb with
anything else.
This is not a low speed issue too: game runs at 100% speed.
Machine specs: C2D E8400, ATI HD5450, Win7 x64, X-Fi Soundcard.