Neither the Swell chamber nor the choir chamber has any extra room for speakers - regretfully. Both are packed with pipes.
I still have to operate those two sets of louvres under Hauptwerk's control. Therein lies the problem.
Rereading Mark's comment on how he controlled physical louvres, however, got me to thinking that I could do the same thing as he did adding the 8-contact roller back in the equation along with the 10k potentiometer - with another piece of Rube Goldberg's hardware linkage for so doing.
Each of the eight contacts could be recognized - by Hauptwerk - as a switch on input - much like a thumb piston (although not momentary contact). Then Hauptwerk could output to one of Midiboutique's output pipe drivers - although not a pipe, but a portion (1/8th) of the air motor. I think this would work. As the action is reversed, the 'pipes' would be reversed as well.
Am I correct in this thinking?