There are two ways to change the pitch of the violin: 1. The pegs on the violin can be turned back and forth in order to tune the violin to a specific key. The first string i…s tuned in G, second - D, third - A, and the fourth - E. Some electric violins come with 5 strings, the fifth coming before G and tuned in the key of C. 2. Below the bridge of the violin rests fine tuning equipment which will make minor adjustments to the pitch. ( Full Answer )
You buy a new string, and put it on your violin. A broken string can't be fixed. A local music store should carry violin strings. They are fairly cheap, even if you get a good… brand. ( Full Answer )