via Akikaze
"Here's an interesting mod I have had installed into my Yamaha CS-40M. It uses the portamento pedal input. A stereo plug is inserted. Portamento input is still available using tip-sleeve and the stepper using ring-sleeve. The program stepper can step backward and forward through its memories, one at the time. Depressing the pedal for one second makes the program step forward; depressing it for about two seconds makes the program step backward. Jumpers are available for selecting a normal open or a normal closed switch (1), for stepping through one of either bank or both banks (2) and for stepping forard or forward and backward (3). Here are some pictures and documentation."
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