for two reasons:
the first is the possibility to plug in headphones. Which is very convenient in concert, an ear for the pure theremin sound without any effect, and one ear free to listen to all the other instruments/singer to have a global overview of the performance.
the second is the ability to control other devices with CV inputs. Take a guitar player, plug his instrument into a Moog MF101 pedal, use the output Volume CV from the theremin and change the sound of his guitar!
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