Käsisäätöisistä

Käsisäätöisistä refers to a class of musical instruments that are operated by hand and produce sound through a mechanical or electronic mechanism. The term is most commonly associated with accordions and related instruments like concertinas and bandoneons. These instruments typically feature a bellows that is expanded and compressed by the player's arms, forcing air through reeds or other sound-producing elements.

The left-hand side of a käsisäätöisistä usually controls a set of buttons or keys that produce bass notes and chords, providing a harmonic and rhythmic foundation for the melody. The right-hand side typically has a keyboard or a set of buttons that play the melody notes. The specific layout of these controls can vary significantly between different types of accordions and even between different models of the same instrument.

The sound of a käsisäätöisistä is generated by air passing over tuned reeds. In older or simpler models, these reeds are metal strips that vibrate when air flows through them. More advanced instruments may use electronic sound generation, with buttons triggering synthesized tones. The dynamic range and timbre of the instrument are controlled by the speed and force with which the bellows are manipulated, as well as the player's touch on the keys or buttons. Käsisäätöisistä are found in a wide variety of musical genres, from folk and polka to jazz and classical music, and are particularly prominent in the traditional music of many European countries.