What to do about a high pitched hum coming from my amp when adding a pedal to my signal chain.

Let me write a diagram of my signal chain:

Fender '72 Reissue Telecaster ----> Rocktron Cyborg Distortion ----> Crybaby 535q Wah ----> Boss GT10 Multieffect processor ---> Peavey 6505 or Fender Hot Rod Deluxe.

I get a really high pitched hum when I have both the Cyborg and Crybaby in but as soon as I remove one the hum goes away. Any ideas?