This time, apparently the sound problems are fixed and things should be running much better then before.
[What's New 2.0.6 - October 21, 2008]
* Right audio channel corruption fixed (thanks cyberdog!)
* Low pass audio filter turned off (muffles audio)
* Changed to alternate audio filter
* PAL Timing corrected
* Cheesy/2X video filters fixed
* Qoob Pro modchip support for GameCube (thanks emukidid!)
http://gbatemp.net/index.php?download=3543
[What's New 2.0.6 - October 21, 2008]
* Right audio channel corruption fixed (thanks cyberdog!)
* Low pass audio filter turned off (muffles audio)
* Changed to alternate audio filter
* PAL Timing corrected
* Cheesy/2X video filters fixed
* Qoob Pro modchip support for GameCube (thanks emukidid!)
http://gbatemp.net/index.php?download=3543