We all know about the Theremin, but what ever happened to the Theremin Cello?
"It was also used by the great Stokowski to reinforce his orchestra's bass section, it is said that the subsonic rumblings made some of the orchestra members complain of sickness...... was later abandoned due to the side effects caused by subharmonic frequencies on the orchestra's string section."
Promising technology abandoned because of a couple of whining underpaid violists. Ready for an upgrade by some modern bands. The kids might like the side effects.