I had been using the bass at my school (its a cort, never heard of them) and since I could only use it at weekends every time I played it I got blisters on my plucking fingers. Now its the holidays and I hadn't played for two weeks, then I picked up a different bass and played it for ages and my fingers are fine. Why is this? Are some strings more painful to play or what? p.s. I have no idea about different sorts of strings or what strings were on the basses in question.