Kubuntu 12.04 no audio in video

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http://askubuntu.com – I used to have Windows 7 and then Mint 12 KDE on a Dell XPS 8300, but now I just upgraded to Kubuntu 12.04. However, audio/sound is extremely volatile. Here's some info: 1) On Windows 7, everything was working fine. According to the Device Manager, I had Creative SB X-Fi, driver 2) On Mint 12 KDE, everything was working right after installation. 3) On Kubuntu, Phonon (in the Device Preference tab) shows 3 sound devices: - X-Fi Titanium series [EMU20k2] Analog Stereo - Built-in Audio Analog Stereo - GF 110 High definition Audio Controller Digital Surround 5.1 (HDMI) Two questions (HowTos)