There are some instruments in the world that use the use of only hands without the help of supports (not rings, helmets, bracelets, etc.), such as the Theremin (radio frequencies) and the Soundbeam (ultrasound) but none of them can boast of having mirroring, essential for the use of therapist / patient. The MidiFly® instead allows the creation of a therapist/patient sound dialogue with the simple presence of two people facing each other, moving both hands. It is also a scalable software, in the sense that it allows any type of sound, any type of sound combination and whose virtual grid can be modified at will from 2X2 to 8X8 in the measure of one meter by one meter per meter, right in front of your body.