I just ordered a Helix and it should arrive tomorrow. In preparation, I found a complete listing of the Helix blocks at dshowmusic. I made the screen shots into a searchable PDF that others might find useful. It seems up to date through firmware 2.60. Included are:
I went through TGP and got all of the info about the Helix models I could find along with some "hints" and put it in a word document for myself. I wish there was some kind of official Line 6 document with this kind of info in it. Here it is if you want to look at it. It's not really organized all that well but, hey, I created it for me. It's 40 pages long. I had to split it into two documents to attach here. It is in the old Word format.
Helix Models Info 1.doc