Answer:
CAD, or computer-aided design, refers to any software used by architects, engineers, or construction managers to create precision drawings or illustrations of new buildings as either two-dimensional drawings or three-dimensional models.
The instrument described is a clavichord.
Although not very popular nowadays, it was important between the 15th and the 19th century. In popular music, variations of it can be found in songs by artists such as Stevie Wonder and Bjork, but they mostly used the electric version of the instrument.
