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Read datasheet for AMUX component (Analog Multiplexor). Might be that in the project a trick is used when bit 0 is turned on. Disgusting is: The author did not use an AMUX component (which is pure software) but accessing the AMX- registers programmatically.
Learn and use the AMUX component.
Get hands on a quite more modern PSoC design as a PSoC5 for few money.