is it possible to use GR4 as a host for other VST plug ins? i was wanting to use my LeCto and/or similar plugins for the guitar sounds but use the GR4 cabs and effects. can i do this? if so, how?
It's can't be a host, but you can run an instance in front of LeCto for effects (with no amp or cab) and an instance behind LeCto for the cab (just take out the head).

Your best bet is to use impulse responses not from GR4, though. I do sometimes still use GR4 effects but the cabs are pretty rubbish.

Check out the new stickied amp sim thread.
yeah i tried that and it loaded down my computer to freeze and crash levels. oh well.