[PD] polygate~, demux~ mux~, mtx_*~

[puredata at 11h11.com]

hi,

i need to route "1 to x" & "x to 1" audio signal. demux~ (demultiplex~  
on pd-extended) and mux~ are doing exactly that, but when switching  
using a number box = glitch. polygate~ have a fade option that avoid  
this glitch but there's no couterpart (like unpolygate~) and finally  
mtx_*~ on pd-extended linux 64, i cannot create the object (i don't  
know what to import).

any advice?