It will normally be available in less than a month.
 
Passive Filter 600ohms In/out 
Cinemag Hi Quality Inductor with Mu Metal Can 
Wima capacitors 
NOS RTF Rotary switch cleaned and ajusted 
New PCB board design
Handbuild in France by Me :) 
 
New features :
 
Toogle switch in Frontplate to change the color of the sweep filtering .
Resonnance potentiometer to change the "load" of the filter .
 
In fact , It change the peak volume at cutoff frequency . From Softer to maximum .  ( depend a lot of the material connected ) if use a line input , insert or  instrument input from the mixing desk , the peak can change beetween 8db to 15db max . This potentiometer can ajust that ( Cool if you use the filter in a recording chain !  ) 
 
DEMOS  : ( Wav / video / Gif files to show the curve of the filter ) 
 
https://drive.google.com/drive/folders/1ZVJcrEj50SX-NEm95HhPykTjLxgUElf3?usp=sharing