I am new in digital circuits,we have been told to create a schematic diagram that looks like a polyphonic synthesizer.Now i have an encoder four resistors in parallel and an oscillator,how can deign in such a way that it gives me an on an off swicth as an output?please i need some help

 

I don't see your schematic.

Have you looked up the definition of "polyphonic"?

If so, how many oscillators do you think that you will require?