I am running Ubuntu 13.04 and I am using Asus Xonar Essence One as my sound card. Alsamixer sees the card, but can not control volume - doesn't recognise any outputs. PulseAudio driver worked out of the box, but behaves in a most strange way.
First of all, PulseAudio sees two outputs for some reason: "Analog Output" and "Digital Output (S/PDIF)". It makes no difference which one I choose - both work, but are behaving strangely.
Now the main problem starts here: sound usually works fine as I start Ubuntu, but then if I start a video (youtube and other web players,vlc) or start a skype/mumble call, or start any program at all, there is a random chance of sound slowing down or speeding up (so the sound becomes way too deep or way too high pitched, with occasional stutter). This happens especially often in vlc as I watch 720p/1080p videos. Even pausing and then resuming can often cause the sound to speed up or slow down. I would also like to add that system volume always resets to 100% every time I start Ubuntu.
I am wondering if anyone can help me as I have googled and have not found a single person with a similar problem.