This Pedal is currently available.
Filter
From website:
RF20 Resonant Filter FTelettronica
-Low Pass Filter Cut Off Frequency
-Low Pass Filter Resonance
-High Pass Filter Cut Off Frequency
-High Pass Filter Resonance
-Input Level
-Balance
Input and Output: 6,3 mm Jacks
LP Freq., LP Reso., HP Freq., HP Reso. : 6,3 mm Jacks
Power: 18v DC Negative center
76mA
True Bypass