It is sometimes difficult to tune a guitar without a tuner. OOBOX Guitar Tuner is part of virtual tuners that have much success on the market. First, the interface is very intuitive. In addition the software offers two methods of tuning. The first is to the ear, that is to say that the software will sound of each string and you will have to adjust the tension to have the right tone. The second method consist of plugging the guitar into the sound card and you get the right tone once the needle is on the green.
It can change the frequency when playing with other instruments, calibration varies between 430 Hz and 450 Hz.
There is a choice between several types of guitar to facilitate tuning. One could describe the utility of professional since it has all the tools necessary to provide several types of guitar.