[Glastonbury] Downgrading with apt-get

[tim hall]

This is a fairly debian-specific question so I guess I'm asking Martin if I 
might pick your brains or any of the other more experienced Linux heads out 
there.

I use dselect as a frontend for the whole apt-get upgrading mechanism. It's 
brilliant for upgrading - I'm running Debian Stable on a 
Linux-2.4.18-586-demudi kernel. I recently added the demudi/devel sources to 
this list. This was not necessarily the best move and due to various reasons 
I failed to install ALSA properly. I've tried dpkg-reconfigure and it keeps 
telling me that I'm missing a module that clearly /is/ missing from the 
module sources.

I can go into details if you like, but I think I shall bother the demudi and 
Linux Audio Users list on this one first.

The question really, is how do I get back to where I was before I started? If 
I comment out the relevant line in /etc/apt/sources.list will dselect 
(apt-get) allow me to replace the programs with the earlier versions? (from 
demudi/stable so to speak).

The development version of the 2.4.18 kernel that I'm using does seem to be 
an improvment and I'm living in hope that I might be able to get either MusE 
or Rosegarden-4 to run properly on my system - The clients work ok, but have 
great trouble connecting to the sound subsystem, which is a bit useless when 
you're trying to edit MIDI files.

Thanks in advance

tim hall