How do you use both Pulse Audio and Alsa?

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http://askubuntu.com – Can someone explain the relationship between the different sound components and if they all need to be installed in order to get sound? For example, I have one called "Playback: ... (PulseAudio Mixer)" and another called "Intel ICH5 Alsa Mixer" which both seem to affect my sound. Can I uninstall one of them and still have working audio? (HowTos)