So Jaunty 9.04 NBR has the same issue with the speakers displaying a "crackling" sound when you mute them/put the volume to a low level with the default settings that EasyPeasy has...
Here is the quick fix so at least muting works:
1. Go to Preferences > Sound.
In order, make the boxes say this:
Autodetect
Autodetect
Autodetect
HDA Intel ALC269 Analog (ALSA)
Playback: ALSA PCM on front 0 (ALC269 Analog) via DMA (PulseAudio Mixer)
Make sure "Master" in the box below is highlighted.
2. Right-click the volume icon on the Panel, select Open Volume Control
In Device, select HDA Intel (ALSA Mixer)
Make sure the sliders for PCM and LineOut are at maximum.
~Jeff
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