electro harmonix frequency multiplexer

[Martin Czech]

I recently came across this frequency divider (well, why multiplexer?!).
It basically converts the frequency to an octave lower,
in order to convert guitar into "bass".
I saw a scope screenshot, sine in and (almost) sine out.

? Huuh ?

Is this simply done via band limiting the ff output or is there
some magic inside this effect box that I don't understand yet?

Are there any schmatics?


m.c.