Trying to find a realtime patched kernel for Etch

[Nigel Henry <cave.dnb@tiscali.fr>]

I realise there are no realtime patched kernels on the main debian repo's, and 
have been googling a bit, and found this.

http://pkg-freebob.alioth.debian.org/lowlat.html

It says to add the line below to /etc/apt/sources.list, but after running 
apt-get update, and opening synaptic, I can't find a source pkg for the 
2.6.21 kernel.

deb http://pkg-freebob.alioth.debian.org/debian unstable main

The only 2.6.21 kernel there appears to be a realtime patched one, but is a k7 
one. As my machine uses a 1.3GHz celeron, I don't suppose this is going to 
work, is it?
linux-image-2.6.21-2-k7rt8

Anyone any suggestions to get realtime working, if the above kernel is a no 
goer?

The problem I have is that when starting jackd there are loads of xruns 
showing in it's messages, and when playing a music app, horgand for example, 
I am getting static like noise every so often when playing notes.

Any help/suggestions appreciated.

Nigel.