I think one resistor might work but with the rotary switch I think it adds a problem
I followed this circuit
look at last circuit in particular. why reinvent the wheel?
basically same circuit but added rotary switch.
That's one of the circuits that I was referring to. There is no need for 10 dropping resistors. Only one output at a time is high, driving that LED through a resistor. If all the cathodes are connected to one resistor, the one conducting LED will pull the resistor high, reverse biasing the 9 other LEDs on the low outputs. Attaching the reset pin through the switch to the outputs/LED-anodes would not be a problem.
Ken
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