Mults allow you to copy a signal (say an envelope triggered with your voice, to send it to both VCA and filter), etc.

-- toodee
WOWWW, thanks a lot for all those really appreciated feedback and tips.
It give me already a lot of experimentation desire !!!
I will investigate al those video , i'm very happy to discover this very generous community :)
And, can i ask you what do you think of my eurorack ? For you like it is now its a good starting point ?