Slackware 13 sound issue

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http://www.linuxquestions.org – I had Slackware 12 on my computer for awhile with no problems. Then I tried Ubuntu and did not stick with it very long so I went back to Slack 13. Now my sound works but only one program at a time can use it. How do i fix this? I will be listening to a song and have firefox open on youtube and it wont play the youtube sound. I've searched but cant find any answers. (HowTos)