[sdiy] filter cutoff and pitch manipulator idea involving joysticks

[Milo Barrowclough]

hi everybody
 
i am experimenting with computer joystick controllers, dismantling them and the like. i have discovered that both axes of the joystick controls a separate potentiometer i.e. one for x-axis one for y-axis . i think that the value is around 470k. i think it would be cool to modify the joystick so that one axis varies filter cutoff and the other axis varies pitch of an oscillator. hooking it up to control cutoff is simple enough, just tie one end of pot to supply voltage and the other end to vcf cv input. but pitch is more tricky. ideally i would like to have 4 or 5 pre-determined pitches, tuned to a certain key or scale, (i.e. 5 pots) , which are switched to vco cv input. which of the 5 pitches depends on the position on the value/position of the joystick pot. so in practice this would mean converting the varying voltage level from the pot into a fixed pitch (one of 5), which ever is closest. how could i do this?  
i think that what i am looking for might be called a pitch quantizer.
my skills are rudimentary, so it would have to be a fairly basic circuit.
thanks

		
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