To anyone how is going to build this FX,  i recommend that you use the updated schematic from the make mag Blog.
http://cdn.makezine.com/make/blogs/blog.makezine.com/upload/2009/10/build_an_experimental_echo_pedal/Echobenderrev02.jpg

I've just breadboarded it and its all good like.
they is even a handy parts list if ya need one

by the way pete top notch work. i'm loving this circuit's mods. Keep up the good work.
cheers 
mrmrshoes