For the past month I've been having problems with my tuning and I finally figured out that the numbers and letters in the corner of my tuner corespond with the string. This whole time I thought my guitar was just out of tuned, when all I had to do was tighten the strings alittle more. Here's my new problem. I don't know what letters correspond with each string. I thought 'HC' was meant for the lowest string. I kept tightening it until I could get to 'HC' but the string broke. Can someone help me out here?