Few problems with VSTs

Hello, I wonder if anyone else is having the problems I am having with Garritan GPO and other VSTis . First, I can't change an instrument after I have assigned it to a staff. For instance, I created a staff with GPO's Violin and written several measures. I meant to use the Violin section, so I went into Score setup and changed that staff to Violins I, but the sound would never change. Anyone else have this problem ?
Second is that I can't get a Trill to work with anything except Notion sounds. Does the library have to have a sampled trill for this to work ? Can't Notion make any pitched instrument trill ?
And third is that my trumpets from GPO always sound legato unless I put other articulations in. I can't get a normal tongued sound out of them. They sound good, but I don't always want either legato or stacatto. Isn't there an in between ?
I like the program very much, but I sure would like to figure out a way around these issues. Maybe its just user error problems ?
Thanks
rlo
Second is that I can't get a Trill to work with anything except Notion sounds. Does the library have to have a sampled trill for this to work ? Can't Notion make any pitched instrument trill ?
And third is that my trumpets from GPO always sound legato unless I put other articulations in. I can't get a normal tongued sound out of them. They sound good, but I don't always want either legato or stacatto. Isn't there an in between ?
I like the program very much, but I sure would like to figure out a way around these issues. Maybe its just user error problems ?
Thanks
rlo