Rudementary sketch of a "gear-shift" for my PSG...
![Image](http://www.gunlaug.no/att/div-2011/psg-var-2.png)
...to change which bellcrank axle a pedal or lever is pulling on.
Using the same "hinge" as for the halftone/fulltone stop, the gray wheel with teeth is operated by right-knee vertical lever (RKV) in 90 degree turns between positions - haven't drawn the turning-mechanism yet.
- When hinge is straight it will push on the guided pull-rod, thus the bellcrank that rod is attached to will turn with that pedal or lever. Turn a bellcrank = make a change. (In the sketch the hinge is never quite straight, but that's just a flaw in my rough GIMP-drawing.)
- When the hinge-arm is lifted by a gear wheel tooth the hinge will no longer be straight, thus can't push with any force on the guided pull-rod for a given bellcrank - the hinge will just "bend up" more. This means no pull = no change.
- The gray "gear wheel" must lift hinge free - not engage it for pull, as the entire mechanism will otherwise be exposed to quite some force if I want to "change gear" while geared pedal/lever is activated. By lifting the hinge free when shifting gear, the present change will simply be de-activated - go back to neutral - and new pedal/lever/change combination be ready once the pedal/lever has been briefly released.
Intend to build the entire "gear shift" as a module, and attach it inside the skeleton above RKL/RKV/RKR since most gear shifts will be for RKL/RKR levers and RKV acts as "gear stick". Have also contemplated using the same gear shift for pedal 1, 4(C) and 5.
My thinking is to keep the "normal" changes on the 5 pedals / 4 levers in one gear position, and switch in some of the less used changes on the "normally less used" pedals/levers if/when I need them.
Although I think I will find it impractical to have more than 4 gear positions to keep track of while playing, only lack of space and sensible changes on a 10 string PSG limit what changes I can switch between via such a gear.