 The Italian-American firm Petosa Accordions imitated the Elka 77/Iorio G accordion electronics to create their Petosa Series II electronic accordion.Many digital accordions are MIDI controllers, as these accordions do not make sounds; rather, they produce MIDI messages which can trigger sounds when plugged into an external sound module.Like other electronic instruments, such as synthesizer keyboards, digital accordions or their sound modules are plugged into a keyboard amplifier or PA system for live shows (or directly into a mixing board for recording).