I wanted to let folks know, for those who haven't found them or arent of bass usability with the above that the HD500X comes with a setlist of presets for the bass guitar that work quite well called Bass-Aco-Voc. I find it much easier to config this via computer than via the knobs and buttons, for now at least. Now i just need to find a case for this. A 6 string MTD Z6 plugged into this and connected to a Markbass Minimark was simply fabulous.
Nice I have a PRO X in my rack for my guitars but I've never really played with it as a bass processor though I've wanted to do that. You'll get used to the panel interface...it's well done although there are a few annoying quirks. Share some of your bass patches if you find some more.
It is definitely easier to build patches via the PC based Editor, but "tweaks on the fly" are pretty easy too without having to lug a PC around with you. The HD's a huge improvement on the old XT series (didn't try the X3's).