The Duet concertina is a family of concertinas, distinguished by being unisonoric (producing the same note on the push and pull of the bellows, unlike the Anglo concertina) and by having their lower notes on the left and higher on the right (unlike the English concertina). Instruments built according to various duet systems are the last development step in the history of the instrument and less common than other concertinas.
The Duet concertina is a family of concertinas, distinguished by being unisonoric (producing the same note on the push and pull of the bellows, unlike the Anglo concertina) and by having their lower notes on the left and higher on the right (unlike the English concertina). Instruments built according to various duet systems are the last development step in the history of the instrument and less common than other concertinas.
Source: Wikipedia "Duet concertina" · CC BY-SA 4.0
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