The aftertouch value should read 0x0 then, for a value of 0?
Yes 0x0 is the same as 0.
In any number base 0 is zero 
As a curiosity I had a computer system that would work in any number base you set it to. However, whenever you printed out what number base you were in it always printed 10.
This is correct, your task is to understand why. 