have you ever considered thinking about maybe using analog switches?

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The on resistance of normal CMOS analogue switches varies substantially with the input voltage, especially at their minimum supply voltage. Therefore, if you want to minimise distortion with normal CMOS analogue switches, you probably have to come up with a circuit topology where there is either very little signal voltage on the switches or very little influence of the on resistance on the transfer, and you have to use the highest possible supply voltage (usually +7.5V and - 7.5V for switches in the CD4000B-series).

For example, with a FET input buffer op-amp directly behind the switch, signal-dependent variations in the on resistance will do much less harm than when you drive a substantial load directly from the analogue switch output.
 
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