Hi Lorie,
I have the Cresendo also and had the same problem. The walking foot that comes with the machine is not very good for in-line quilting designs as it has a curved side, so you can't use the edge of the foot as a guide against a previous line of stitching. Also, there is no place for a guide bar to attach.
I ordered the "regular" Babylock walking foot, which is part number BLDW-L. It comes with two bars for in-line quilting and it is smaller and has straight edges, like a traditional walking foot. You can order one on-line at this link:
http://www.sewingpartsonline.com/wal...ck-bldw-l.aspx
Also, Brother has a similar alternative for their "Dreamweaver" machine, which would fit the Crescendo, but I don't know the part number. You can probably find it on the Brother website, and they do take orders and ship directly from their site.
Hope this helps!
Solomae