Try IC on "analog switch".
They act like a mechanical switch.
Make of semiconductor, and can conduct analog signal.
You can make use of the IC to multiplex your signal
to the desired input channel.
One such switch is
ADG451, ADG452, ADG453, ADG511, ADG512, ADG513, CD4066BC
There are many other analog switch IC from different manufacturer.
I find ADG series from company "Analog Device" quite ok.
Newer IC could have been in the market now and perform better.
I have not tried the newer IC yet.
**broken link removed**