So according to String Theory, the properties of Elementary particles is due to the vibrating properties of strings. Lets pretend that technology was developed that could alter the vibrations of strings, also assuming that string theory is correct. If we change the vibrations of the strings then the particles could be changed to something else, which would result in a change in mass. According to E=mc^2 this would also result in a change in energy. Would it be possible to generate energy in this manner, by altering the vibrations of strings?