AW: MXR envelope follower..?how works?

[Haible Juergen]

	>Thanks everyone.... consensus is that it's a switched capacitor
	>filter, pulse width modulated by the envelope.
	>Certainly, this is what I suspected..... but the ckt is by no
	>means obvious to me, even knowing this. I'm putting it in the
	>'weird' basket (with a few Electroharmonix things and the Korg MS20
VCA)
	>until I become wiser or marry a qualified Electronic Engineer
	>(both unlikely at this stage).
	>
	>This sort of thing does make me wonder how many 'cheap tricks' are
	>lurking out there in pedals....
	>
	>paul perry melb aust

Do you know if it is somewhere on the web ?
If I see it, maybe I can make some comments ...
I love strange stuff (;->)

JH.