As root on a terminal type:
Select your card and let the script do it's thing.
Run alsamixer to set up your volumes. When you do that, make sure that it selects the correct soundcard. Most of the time it does, but just in case, you can do the following:
For card number 1:
Once that completes, type the following as root:
About the hissing sound, when you run alsamixer to set the volume control, look to see if any of the IEC* channels are enabled. If they are, just mute it.
Hope this helps.