I have mapped cue volume, cue mix and sample volume knobs on my mixon 8 to control neural mix vox, harmony and drums respectively. However they now have both functions even though in the midi mapping they show as neural mix. They control both their original functions and the new mapped ones.
Here the basic functions are obviously hard-wired into the hardware and are not determined by the DJ software or the mapping. In such a case, this cannot be overridden by changing the mapping.