The following review written by one of the Software Informer contributors applies to version 2.7
Guitar FX Box is a multieffect sound processor for the electric guitar. It has many realistic effects akin to those produced by an analog processor, such as distortion, echo, wah-wah, reverb, tremolo, and others. All of the effects are fully adjustable via a very easy-to-use interface, so you can go, for example, from a soft, bluessy overdrive to a savage, heavy metal-style distortion.
Another interesting feature is the possibility of processing existing .wav files. Simply choose the sound file you want to process and add the desired effects. Also, you can use a backgroud track to play along with it, creating new music over the track. You can mix both tracks and save them together or save each track as a separate file. The program also includes a very handy tuner which you can customize for alternative tunings such as open D and G, dropped D, and so on.
You can use the trial version of Guitar FX Box during 30 days. After that, the program disactivates itself, so you must purchase a license if you want to continue using it.