ergonomics, guitar arpeggios, mac keyboards and mice
For the longest time I've been plagued by a chronic inability to play arpeggios on my guitar using my index finger. Playing a simple pim has at times become almost impossible, yet pma is fine and precise. Similarly playing scales with 'im' alternation has become very difficult, my speed being less than half that when playing with ma. Things have got so bad that I've resorted to hybrid picking, that is holding a plectrum between my thumb and index finger and using the other three fingers when playing fingerstyle pieces.