A special pitch-bend wheel is used for this, which we wrote about here, MIDI expression pedal, or an ordinary expression pedal connected to the computer via this simple adapter. However, in digital pianos and MIDI controllers, like on the guitar, you can bend and lower sounds at much smaller intervals. The semitone is also the smallest interval between notes in MIDI. And two minor seconds, or two semitones, form a whole tone.
A semitone corresponds to a minor second. On the guitar, semitones are between two frets. On a piano, it corresponds to two adjacent keys - it fits between the white and black keys, or in two cases between two white keys (those that are not separated by a black key). The semitone is the smallest interval between sounds.
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