Audio playback is clipped and has low volume

Hi, I'm hoping that someone can help me debug my audio problems.
The problem is that audio playback is clipped and has low volume.
The details of my setup are as follows:
- An onboard soundcard (ASUS M4A78LT-M-LE motherboard), identified as Intel HDA in dmesg:
description: Audio device
product: SBx00 Azalia (Intel HDA)
vendor: ATI Technologies Inc
physical id: 14.2
bus info: pci@0000:00:14.2
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=snd_hda_intel latency=64
resources: irq:16 memory:f9ff4000-f9ff7fff
- ALSA (snd_hda_intel driver) and Pulseaudio
My ALSA mixer settings (which were used in the recording shown in this post) are at pastebin.
The mixer settings were chosen so that all "dB gain" is 0.00 for all columns in alsamixer.
Recording an MP3 (played at full volume) from the Stereo Mixer source in audacity I gives output which looks clipped and has low volume (link).
This occurs with any MP3 and any other sound source (Youtube in Chromium, etc.)
The problem does not occur when I boot into Windows XP, so it doesn't seem to be a hardware problem.
I'm also attaching a screenshot of my alsamixer playback screen for the soundcard (link)
Thanks for any assistance!

Hi,
I have the same problem since December 2011 with a similar Mainboard (Asus M4A78T-E).
Did you resolve your problem?
Thanks

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Audio playback is clipped and has low volume

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