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> since i already have a digitech FS300 - how can i put it to use with the
> EDP?
i did this 
(except i chose record, multiply, and undo 
and use the dedicated overdub jack for overdub)
you just wire each button across a resistor to ground
all in parrallel. the resister values for each function are
listed here:
    http://www.loopersdelight.com/tools/echoplex/echopedals.html
(as well as a clearer description of the connections)
i like the positive feel of the buttons on the fs300
compared with the plastic buttons on the edp footpedal...