i do have all the documents. but not really an idea on how to go about it. could you maybe elaborate. i do know where everything goes on the boards - i lack the engineering knowledge.
I think you use a pot connected to where it says i/p pot (instead of jumpering the pads) on the i/o board & leave out the hold pot, but as with all Igors projects he doesn't give you it on a plate. The 3 that I have built have all been EMI versions so I don't know for sure. However read the attached folder (part of his documentation) & it may convince you that it is better to keep the hold control like the EMI version rather than the Chandler version wth the input pot.