| Notes | The EVIs had a dedicated synthesizer module. It look to be a single oscillator synthesizer with very simple controls (5 knobs and 4 switches).
The first EVIs outputted a gate and a single control voltage. The gate was triggered by an air pressure sensor in the mouthpiece. Air was not actually blown throught the instrument but throught the mouthpiece which measured the air pressure inside. Just like a trumpet, the harder you blew, the more air pressure was registered. The EVI outputted control voltage based on the keys which were depressed and the position of the cylinder at the end of the instrument. A combination of rotating the cylinder and thumb rollers selected the octave and the notes were selected by the three springed switches on top, positioned similar to a trumpet valves. |
