Ask Patch Foundry: Why the Reversed Modulation Wheel?

I got this email from Mark this week:

“Hey man, I bought the cover band collection. Very nice work. I learned a ton from looking at how you laid out each song and am doing the same for my own original songs.

The only funky thing is the organ volume on the expression wheel is reversed compared to every other program I've seen and reversed compared to all the volume faders on the organ.