CyanogenMod 10 has been available for the HP TouchPad for a while now, however it has always been an early build with some features not working. That being said, an update has recently come available and this latest build of CM10 for the TouchPad has fixed the issues with audio. Simply put, those who update their TouchPad to the latest build of CM10 will now have audio. In addition, Brad Linder over at Liliputing noted that he is now able to stream HD videos from YouTube and Netflix which means the hardware video decoding is working. Nonetheless, CM10 for the TouchPad is still considered a beta release and should only be used by those who can accept, deal with and/or work around any quirks. Me personally, my TouchPad (which has now been unused since I picked up my Nexus 7) is still sporting CM9 Alpha 2.
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