The fingerings of a ‘regular’ trumpet require only three fingers to move three valves. With these you are able to play all the notes on the instrument. This is why some people can perform on two (or more) trumpets simultaneously, one hand is enough for one trumpet.
But, because all of the notes played on a trumpet are created with the help of embouchure, three valves are not enough for an electronic trumpet. Luckily this problem is partly solved already by the the use of a fourth valve like it is sometimes used on the Euphonium and other instruments. This fourth valve makes it possible to create 16 (2^4) combinations and that is more than enough to play all notes in the octave. The only small problem that arises is the lack of physical support that is normally provided by the pinky.
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