Thanks for the reply, Moto. I am interested in handheld electronic instruments, in short, because I wish one existed that I could play with. I am talented with an ear for music and a great memory for harmony, but I am physically clumsy and have never succeeded in mastering an instrument sufficient to allow me to make my musical thoughts a reality. Electronic instruments promise to allow a more direct transfer of musical thought to audible sound, because they may focus on ease of input without dwelling on physical acoustical design.
As I see it, the problem of allowing input into such a device that would be both a) intuitive, b) easy, c) accurate, and d) fast is a very challenging one, which may not be possible to solve according to the standards I would hold such devices to. But if it could be solved, I think the solvers (and, more accurately, the corporation who would buy their design) could make a huge number of musically-inclined people happy, and make a bundle of money in the process. I have searched frequently over the past few years for work being done on such a device, but I have seen little in the direction of innovative prototypes; bento box was one significant exception, and I have been meaning to write you for at least a year.