Actually it's a recording demonstrating the " Hellertion " . It's a vacuum tube oscillator instrument that used a metal touch plate as a controller . It was made by Peter Lertes and Bruno Helberger , and the recording has Bruno demonstrating it . It's one of the first electronic intstruments with a touch plate controller . I also have some recordings of Pierre Schaeffer and Pierre Henry . I am about to get some recordings of Japanese artists doing early Tape music from the late 40s and early 50s .