The term scenthesizer has been coined in the science fiction a long time ago. Now it is a real option marketed as a djtechtool. Have a look!
The Scenthesizer – AllSense. Sensory Communication
Discover how ScentAir™ and Heineken Green Room brought the worlds of scent and music together in a collaborative project to realize The Scenthesizer, a prototype of future technology that will allow DJs to create truly multi-sensorial experiences for music lovers.
(Source: https://www.youtube.com/)