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I also use a Liquid Foot +
12 + and have the same issue with an expression pedal controlling the the
factor pedals (not H9) via midi.

For example, using the
expression pedal to control PitchFlex responds slowly; it goes from 0 to 100
moving the pedal slowly but if you move it quickly, it just jumps to 0 or 100.

Same behavior using the expression
pedal through a midi solution box (no LF involved)

So I do not believe it is
the Liquid Foot. Also, the Liquid Foot controls my Lexicon PCM 80 without the

Using an expression pedal
connected to the pedal jack on the factor pedals works as expected. Controlling
the switches via midi CC works perfectly but trying to control any of the knobs
or the pedal has the lag.