<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> All, I upgraded to 13.04 today and the problem with the sound crackling in skype and other programs came back. Luckily I'd kept the link to how I fixed it before (after the 12.10 upgrade). The link is <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <a href="http://askubuntu.com/questions/157891/skype-and-vlc-sounds-sizzle-distorted-bad">http://askubuntu.com/questions/157891/skype-and-vlc-sounds-sizzle-distorted-bad</a> but the relevant parts are pasted below for your information. I applied the solution and everything back to normal. --------- from ask ubuntu --------------- Disabling PulseAudio's Glitch Free Audio seems to have solved the crackling for me (which became unbearable on Ubuntu 12.10 Beta 2) To do this, edit the /etc/pulse/default.pa file in your favourite text editor. Search for the following line: load-module module-hal-detect and append "tsched=0" to the end: load-module module-hal-detect tsched=0 restart pulse (or just reboot your system), and the crackling should be gone. Not sure what the side effects are by disabling Glitch Free Audio, but I can't seem to find any yet. UPDATE: If you don't have a line with load-module module-hal-detect, then search for following line: load-module module-udev-detect and append "tsched=0" to the end: load-module module-udev-detect tsched=0 restart pulse (or just reboot your system), and the crackling should be gone ---------- end paste ------------------------ I hope this may help someone like it just helped me! Regards Andy </body> </html>