If I'm reading this right, the original poster, wants to sample 5 channels, and based on the value of the 5th channel (be it high or low or whatever), send the 1st 4 channels either out these 4 channels or those 4 channels...just like he said, a channel switcher.
If that's the case, why bother sampling the other 4 channels? Just sample the 5th channel and use an output based on that decision as an input to a 2 input AND gate, along with the other input coming from channel X.
2 74L08's (8 2-input AND gates), one PIC12Fxxx (or even 10Fxxx) should handle the 5th channel switching chores.
Of course that's only if I'm reading the project correctly.





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