Bitt makes it sound harder than it is

On the home page of your slimserver is a link in the settings section called 'Server Settings'
Clicking that puts up a text entry box labelled "Music Folder".
So 1 click on the homepage, type and press return ???
Granted there is a lot of text on the homepage but it's not *that* complex.
Oh, and do people realise that slimserver is a standard Debian application? Or you can add slimdevices.com to your apt sources.list and use their badged version)
slimrio is cool but I need to make it use a different remote - as it stands it is really hard to change the volume from the front panel. Fortunately we have source; unfortunately I don't have time

Mark, have you seen the comments here:
http://empeg.org.uk/slimrio/source.html