yes i know how it works, it’s just about the different input and impedance confusion for me.
Mic, Instru (or pre amp) and Line
if i compare to this schem
there are input for Line and another input for Synth level signal, it made me think and ask me question about impedance level.
Barton just demoed a new envelope follower module:
I find this on the @EddyBergman site about the inputs
" - The input for the electret microphone can handle tiny signals in the 10 to 100 milliVolt range which then get amplified by the preamp to boost it upto 8 Volt max. before they go into the envelope follower.
The second input can handle input levels from the 100 milliVolts upto 1 volt range, for use with guitars for instance, and this also gets amplified by the preamp to boost it to 8 Volt max. for input into the envelope follower.
Finally, the third input does not have any pre-amplification so this input can only be used for signals that are already in the 5 to 10 Volt range."
I just finished this Envelope Follower from @EddyBergman 's stripboard
and unfortunately I don’t have a 2nf, I have some 2.2nf do you think this is critical or it’s better to put it aside and wait to order a 2nf ? thx 
here’s
That’s no problem what so ever! Just put in what you have. It’s part of the lowpass filter and 200pF more or less isn’t going to change much.
many thanks !!!
(more character)
Tolerances on caps are pretty loose usually, your 2.2 might be a 2 after all.
The difference between these 2 capacities is very small and given that you are not building a HF circuit I would not worry about that too much. If you ever need a capacitor that is a small as say 100 pF or less, then you need to start looking at your circuit in a completely different way. Then all of the wiring all of a sudden can be considered to have a certain capacitive value. To give an example, I’ve just measured the capacity between 2 copper lanes (without any components attached to them) of a 14.5 cm strip board and found the capacity to be around 10 pF.
Now mine is in the case (excellent module !)
a simple patch with the drum section of the modular into the Env F, Audio out + Env Out in a CV pitch of a VCO and also in a VCF CV.
I must test it with my guitar 
Does this work with 12V (9V using 7809) instead of 15/8V?
yes look at the @EddyBergman website
i use +/-12V too 
nice one! does the HPF work on the Audio output too in yours?
how did you integrate the HPF overall?
No i put the HPF on the Env Out to make some glide Env, just like the Smooth switch but adjustable with a pot. I didn’t need filter on Audio out because we can reprocess it with VCF externally if we want.
Otherwise it is surely possible to do it by also adding an HPF on the audio and with a double gang potentiometer to control both simultaneously
