I was wondering if anybody know's where I can get some good bass guitar effect pedal schematics.  I have a friend who plays bass and wants to venture off into this stuff.

how about an Acoustic 360+ bass preamp?

check charlie's (moosapotamus) or j.c.'s sites.. they've got the schems, layouts, etc...

It's on my short-list of things to build...
"-)

In my site there is a bass distortion. I didn't tried it, so I don't know how it sounds.

yeah if you want the ultimate bass stombox nothing compares to the acoustic 360.  expecially the fuzz.  or another good one is the bass balls.