[sdiy] analog pitch shifter circuit?

[synthplayer88 at spymac.com]

Hi guys,
I was wondering if anyone know how does the boss voice transformer achieve the
voice pitch shifting?
I would like to build an analog pitch shifter does what the Boss voice
transformer do but I am not sure if that is an analog circuit, since all their
new pedals such as the  PS3 and PS5 are all digital circuits.

I came accross this chip that does pitch shifting but only has preset shift and 8
Khz sampling rate :( 
which seems to be kinda lo fi...

http://www.holtek.com/english/docum/consumer/8950.htm

Does anyone know of any monolithic IC that can do what this IC does but with more
flexibility? eg. allows precise pitch shift of any notes up to serveral octaves.

Oh, please do not suggest any DSP or uControllers. I would like to avoid ANY
programming and looking for a simplest circuit to do this if possible :)

How can I apply FM into this? eg. multiply the sound source by 2, 4, 8 hz.....
Can this be done?

Thoughts?