I've used all 8 analog I/O's with Ardour -
works like a champ :)
I just hadnt dug out hopw to use different inputs with Audacity, if it's
even possible.
You'll need a current CVS version of Audacity for this, or the forthcoming
beta version. Multi-channel support (ie more than 2) was only added recently,
and testing of the feature is needed. Contact the audacity-devel mailing list
list if you'd like to give it a go.
Cheers
Daniel