The interface of the electronic musical instruments, has always been a problem of language, that abilitasse the musical dialogue man-machine in order to make satisfactory interaction and the results produced. The conceptual problems that from time to time presented themselves led to different trends, like the one in your music software to graphically show the knobs, switches and sliders hardware, or, as opposed to abstract the devices in representative geometries ( as in the sequencer). Lemur of Jazzmutant implements a technology called 'multitouch', which allows the use of multiple fingers simultaneously to interact with various elements in real time through a screen sensitive LCD. The device connects via Ethernet and uses outside the OpenSoundControl instead of MIDI. Its programmability platform (Windows, Mac OSX, Linux) with an appropriate base library, allows you to invent new tools or check in an absolutely personal existing ones, creating an infrastructure flexible, but well-rooted in the hardware. The fingers, always indispensable tools in both the traditional and the electronic return to be at the center of the composition / performance, though acting on a physical space is always the same, which is illuminated in metaphors and meanings. The mouse, in this case, is then eradicated to maintain one of the promises oldest and least maintained eletronici devices, namely that of an immediate interaction and intuitive, as well as completely coded, ie reinventabile.