If you're ready to add some really different sounds to your set, you'll want the Hiwatt Echo-Theremin. The theremin was invented in 1920 by a Russian physicist named Lev Sergeiyvich Termin (his name was later changed to Leon Theremin). It's a unique instrument because the theremin is played without being touched! As your hand approaches the antenna, the pitch gets higher. The Hiwatt engineers decided to add a new dimension of sound to the digital theremin by adding delay to the unit. The Hiwatt Echo-Theremin has 300 milliseconds of delay that adds more depth and greater ability to create spooky sci-fi sound effects.