Bad audio from youtube and web-browser

Binary package hint: pulseaudio

Sound playback from youtube and web-browser produces really bad sound. This happens in Natty (Ubuntu 11.04). Sound in Ubuntu 10.10 is OK.

Here is an example sound track
http://www.jamendo.com/en/album/14861

The attached .ogg file will let you hear the result.

This computer has two sound cards. I have tested the sound with both cards and the result is the same. All web-apps produce bad audio.

I use 64bit Flash from ppa:sevenmachines/flash.
Ref: http://askubuntu.com/questions/33445/flash-player-for-11-04-64bit

$ dpkg -l | grep -i flash
ii flashplugin64-installer 10.3.162.29-0ubuntu0~sevenmachines3 Adobe Flash Player plugin 64 bit

$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
06:01.0 Multimedia audio controller: Creative Labs SB0400 Audigy2 Value

Notice:
Local audio files (music .mp3, .flac, etc.) play right. Local audio such as local music files play 100% OK.

For audio-recording I use https://launchpad.net/audio-recorder (the best one)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: pulseaudio 1:0.9.22+stable-queue-24-g67d18-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: moma 1621 F.... pulseaudio
 /dev/snd/controlC2: moma 1621 F.... pulseaudio
 /dev/snd/pcmC2D0p: moma 1621 F...m pulseaudio
 /dev/snd/controlC0: moma 1621 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf9ffc000 irq 49'
   Mixer name : 'Realtek ALC887'
   Components : 'HDA:10ec0887,1043840b,00100202'
   Controls : 24
   Simple ctrls : 14
Card1.Amixer.info:
 Card hw:1 'HD'/'Creative Technology Ltd. VF0610 Live! Cam Socialize HD at usb-0000:00:1d.7-6, h'
   Mixer name : 'USB Mixer'
   Components : 'USB041e:4080'
   Controls : 2
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 52
   Mono: Capture 0 [0%] [-20.00dB] [on]
Card2.Amixer.info:
 Card hw:2 'Audigy2'/'SB Audigy 2 Value [SB0400] (rev.0, serial:0x10011102) at 0xec00, irq 21'
   Mixer name : 'SigmaTel STAC9750,51'
   Components : 'AC97a:83847650'
   Controls : 201
   Simple ctrls : 36
Date: Mon Apr 4 11:47:09 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110318)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/21/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0308
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5P41T/USB3
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0308:bd04/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5P41T/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer