Discussion about the Korg PolySix synthesizer

Okay guys,

Anyone help me out here... I have a bank of mixed keyboards and synths -
Korg X3, Roland D50, Yamaha AN1x, Roland SH-09 and Korg poly6 which I have
on a three-tier and a two-tier stand.

I want to be able to control the sustain from each of these (or at least
some of them) - preferably without having to buy five different sustain
pedals.

It is possible to buy a multi-synth sustain pedal (can't imagine how it
would work!) - or more likely, does anyone know whether (or how) I can put
together a unit containing a bank of pedals which I can use to control the
sustain for the synths - possibly two; one for each tier of synths.

Also has anyone got any links to an 'electronics projects for musicans' type
of website?

Apologies if I am asking damned-fool questions here!!!

Frank