I have a Sequential Circuits Pro-fx model 500 modular effects unit with the following effects cards...Digital Delay, Phase Shifter, Distortion, Transpose/Sync. I'm looking for any usefull info on the units. IE... Were there ever any footpedals made for it? What is it worth. How is it best used etc. etc. etc. I also have a sequential T8 for sale for 1250.00 if anyone happens to be intrested.. email me at ccg6944820@aol.com