Along with Sean Hayward, I taught a short intensive course where students made experimental musical instrument prototypes. Here are some of the outcomes of the course.
This string instrument has a bridge that is on a sliding rail so that the pitch and be shifted and unusual ghost harmonics can be formed by the interaction of the two sides of the string between the movable bridge. This instrument also features a piezo electric pickup that was taught as part of the course.
One of the students wanted to remove the frets of his guitar to alow him to play microtonal music. The frets were removed and filled in with black colored epoxy resin.
A very simple and versatile instrument can be made with rubber bands and a piezo electric pickup. Both the pickup and the use of utility boards, where the instrument can be rapidly altered and experimented with were taught as part of the course.