#structural acoustics

• Arcicembalo — An historical keyboard musical instrument from the harpsichord family, designed in the 16th century by theorist Nicola Vicentino, structurally equipped with multiple keyboards and complex microtonal divisions (up to 31 intervals per octave). This advanced acoustic device was utilized to experiment with ancient Greek musical genres and to achieve just intonation in Renaissance polyphonic music.
• Arciorgano — An historical keyboard musical instrument from the organ family, designed in the 16th century by theorist Nicola Vicentino, structurally equipped with multiple keyboards and a complex system of microtonal pipes adapted to render up to 31 intervals per octave. This experimental acoustic device was used during the Renaissance to explore the chromatic and enharmonic genres of ancient Greek music and to achieve just intonation in academic polyphonic performances.
• Arciviolata — An alternative historical name or extremely rare variant for the instrument known as 'archiviola'; a type of oversized or hybrid viola from the Italian Renaissance period, structurally designed to extend the grave and polyphonic register through the use of experimental keyboard mechanisms or by adding extra sympathetic strings.