Dave Smith Instruments SYNTHESIZERS

This is strange. I never noticed it before. I've been going through 
the "definitive guide"(which is fabulous, I've learned a lot that I 
didn't know) and I'm at the section on delay. I've never noticed 
before but my feedback delay 2 doesn't seem to work. Feedback 
delay 1 works fine but when I try FB delay 2 there is no difference 
between off and 99. It's kind of odd that the machine works great 
in every other respect but that one thing doesn't work. Anyone 
else have this problem?

steve