Yes, but one doozy of a Stylohone, to be sure. It could be a real speaker ripper...and it was beautifully made and of very high quality (and a little heavier and more bulky that a Stylophone).
Plus that cute little Stylophone was monophonic. The Buchla we used had 6-note Polyphony (the equally expensive Prophet 5 was still only 5-voice). The touch-plate instruments (you could get a regular keyboard) are worth much more to collectors, as well as those who like using unconventional controls.
There were incredibly complex sounds that were made on the Buchla literally impossible on any of the current synths at that time (and a few since then), and actually it wasn't that difficult to play. The tuning was very stable. Electronic music composers/performers Morton Subotnick and Ramon Sender managed to use them in live performance. Magnificent clangorous sounds were the instrument's specialty, although it still had a lot of analog warmth due to the design of the filters.
The fault lay in the immediacy
of programming, something so much easier done with sliders and knobs on a regular analog like a Jupiter 8, Mini-Moog (or a Prophet 5, for that matter) and, in the studio, time was money.
The Touch Keys idea looks interesting all the same, but I wouldn't dare stick those pads on my precious Tyros4, hence the suggestion of a cheaper controller or an inexpensive digital piano with midi, such as an NP-30. I can't imagine Bill sticking them on his big old Wersi.
Good luck to the inventor.