There are various reasons for musicians to shift notes that come from their MIDI Controller. One example is when a piano player has used to play the song in a different key from the singer, and they need to perform together. Or when the music producer has a tiny keyboard with only 25 keys, and they want to record a piece in a non-reachable otherwise octave.
With the Transpose module, it is easy to shift the key in either direction. Using the slider, you can shift the played notes by semitones. The “-” and “+” buttons will shift the notes by octaves.