Re: Piazzolla,
That may be true, but I'm pretty sure that some Bandoleon/Concertina designs sound different pitches for the same fingering on expansion vs contraction. If a given bandoleon works that way, the player may desire to sound only on expansion to optimize fingering. IOW, that may have been a choice for Piazzolla, rather than a limitation of the instrument.
Marty
That may be true, but I'm pretty sure that some Bandoleon/Concertina designs sound different pitches for the same fingering on expansion vs contraction. If a given bandoleon works that way, the player may desire to sound only on expansion to optimize fingering. IOW, that may have been a choice for Piazzolla, rather than a limitation of the instrument.
Marty