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I am using an integrated Realtek HD Audio sound card, normal audio output works as expected.

Nautilus doesn't show 'dsp' in the /dev folder. Now, why isn't it there?

In the 'Users and Groups' settings Ubuntu says I'm already in the user group 'audio', but just to be sure I also ran a sudo gpasswd -a underyx audio. Still have the same problem.

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What's up with this edit proposal? If I understand correctly, then you totally changed it, somehow, invalidating the existing answers? Please post your new question as, er, a new question instead. (@Olli, if you care to explain more: please do!) – Arjan Feb 10 '11 at 20:19
if I understand correctly then you changed the question in something totally different? That has been rolled back; see the revision history and the edit review. (And @grawity, if your answer was based on revision 2, then please rollback the 3rd revision? You deleted your answer while I was typing this as a comment to that deleted answer.) – Arjan Feb 10 '11 at 20:25
@Arjan: It seems that Underyx himself has added the new question – immediately after posting the initial version (I think the timeout is 5 minutes since posting), so it got merged by SU to "Revision 1". I suppose this would make Olli's edit valid. (Can't say I approve of Underyx's question change, though.) – grawity Feb 10 '11 at 20:40
Okay, @grawity, that question change was bad of course. Now that the original is back, I guess your answer applies (too)? (I've no idea if the currently accepted answer applies...) – Arjan Feb 10 '11 at 20:42
In reply to your comment on my ex-answer: Output redirection will attempt to create the file if it doesn't exist, giving the "Permission denied" error (because you are not allowed to modify /dev). – grawity Feb 10 '11 at 20:42
up vote 3 down vote accepted

When you use pulseaudio you don't need /dev/dsp device. At least according these source: PulseAudio

For OSS applications, PulseAudio provides the padsp utility, which replaces device files such as /dev/dsp, tricking the applications into believing that they have exclusive control over the sound card. In reality, their output is rerouted through PulseAudio.

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Thanks, it works with the command pacat /dev/urandom > padsp – Underyx Feb 10 '11 at 20:13

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