This player, Silvio Dalla Torre, has a really excellent website. I ordered one of his cds and got it last week and it is quite enjoyable! It is really worth hearing and I notice that non-bassists like it too. The mix of repertoire is terrific.
You can't really tell what sort of tuning he uses, except when he goes very high and you know he has to have a high string of some sort; it always sounds very musical. From the picture inside it looks like it is a regular size bass, just with a high fifths tuning. (high"E").
I think this is a pretty rare cd so heres the address if you're interested.
http:/www.haenssler-classic.de
classic@haenssler.de