Your problem is probably the impedance – it should be between 10K and 25K. Don't know what the value is for your pedal – the manual does not say. You could try adjusting the "minimum volume" control.
The EB is a very nice pedal – make sure to get the 6181 (25K) rather than the 6180 (250k).
For expression, a linear characteristic is probably best. If it is logarithmic it is probably more of a volume pedal.
