32-Speed Automatic Clutch Manual Transmission (Configurable, Fast response, Vanilla Create)

As title says 32-speed auto clutch transmission/gearbox using only base create and vanilla redstone which can be configured to whatever increments needed for your application. From input to change a shift only takes 8 game ticks (0.4 seconds) and SU transmission remains active for all but 1 of those ticks. You can shift from any gear to any other gear, no progressing gears required. Input can come in any form into the block the buttons are placed on in the schematic from above or below (observer, redstone torch, redstone link, etc). Redstone Input must end and 8 or more game ticks must pass before the next input has can be entered.

In the schematic the transmission is configured for speeds 8-256 rpm in 8 rpm increments on the output shaft. but you can change these values by changing the values in the rotation speed controllers (set each one to half the desired output since we're gearing everything 1:2 on the output, otherwise reconfigure the output shaft if uneven rpm outputs are needed)

Technically this is a tileable design so removal of slices is possible, as well as the addition of up to 10 slices per bay, totaling in 52-speeds without changing the design or adding very careful input timings so each bay is properly reset when a gear in another bay is selected.