PS,

to use a 4051-type IC with a rotary switch I'd look at using the
ADC of a micro to control S0, S1, S2 and chip enable(s)

I've not done this with a switch but have with a detented pot

So for, eg, a 12-way 1-pole rotary, the 10 innermost terminals
have a resistor such that its selection forms part of a divider to
give a distinct and discrete voltage for the ADC. Positions 1 and
12 can be Vss and Vcc respectively

As each IC is only a 1-of-8, use the micro to select any of a
group of ICs for as big a bank of switches as you need

Some old projects of mine (pre-ADC PICs)

http://home.clear.net.nz/pages/joecolquitt/0pots.html

http://home.clear.net.nz/pages/joecolquitt/mixer.html

Joe

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