I'm a relatively new bass player, got a little under 1 year under my belt (played guitar for a long time prior to that), and one thing I've noticed as my fingertips toughen up is that the callouses make it really hard to use my Macbook. I'm right handed, and when I was guitar exclusive, I never had callouses on my right hand. Well now that I do.. I notice that trackpads on laptops just don't work as well as they used to. Lots of skipping or poor motion detection, especially with my index finger which has the thickest shell on it. Is this common? I've found I have to use the trackpad with my pinky or ring finger to get the best results. Not a side effect I anticipated when I started working on this instrument.