Thanks again for all your help.
I found the right adapter at Radio Shack today and it works perfectly.
It does not have an interchangeable tip, but luckily it is the right size for the VF11.
Here is a link, in case anyone else ever needs one (Catalog # 273-1631):http://www.radioshack.com/product/index.jsp?productId=2049687
First impression: it's awesome!
I only played around with it for about 10 minutes, using my Nord Lead and an SM57 mic.
It sounds great. I'll try to post some sound clips within the next couple of weeks.