From wayne

No wonder drummers drink a lot!!Coffee Break2.....Animal..could be that there is a difference in strength between arms and legs...Your right leg is much stronger than the left if you,re right handed....i think.

I don't think so as I have swapped drums and had others play them both and got the same results. They are very close, but if you listen, there is a slight difference I've learned to live with.... :D