>I'm trying to record in ardour on demudi 1.2.1. When I try to record
A couple things come to mind. First, there've been some patches
recently added to Ardour 0.99 that deal with noise issues, you might
want to upgrfade to the latest version. Second, make sure that all
non-essential channels are turned down or off in your software mixer. My
CD drive makes a terrible amount of noise in its idle state, so it's
always turned off until I need it.
Does the zipper noise occur when you move your mouse ?
Cheap cables can also be a noise source.