The SD3 from Ketron is a sound module arranger workstation. A great unit if you already have a MIDI accordion or keyboard for control, but need the great sounds and arranger features that Ketron provides. Nearly 300 voices, over 1000 percussion sounds, and 200+ styles are built-in so you can create music in a variety of genres and styles. Designed with the MIDI accordion user in mind, the SD3 can also be used with a MIDI keyboard controller. Sustain and volume pedal inputs are provided, along with a footswitch connector that allows you to connect an optional 6 or 13-switch floor unit so you can control arranger functions without having to remove your hands from your accordion or keyboard. Other connectors include a microphone input and output, 1/4" audio outputs, a computer interface, and an optional video interface that"s great for karaoke. Each style has four arrangers with multiple intros, fills, and endings for quick and simple creation of accompaniment. Several DSP effects are included, such as reverb, delay, chorus, and more? High-Quality Sounds Ketron"s sound engine provides realistic voices, percussion sounds, drum kits, and styles for music creation? Designed with MIDI Accordion in Mind Multiple accordion features include bellows-driven expression, left-hand-driven percussion, and more. However, the SD3 can also be controlled by your MIDI keyboard or guitar? Intuitive Interface The multitude of buttons have been arranged for quick and easy access, while the backlit display shows vital information? Arranger Each style has four arrangers with multiple intros, fills, and endings to provide accompaniment in a variety of genres? Arabic Scale The SD3 has 13 footswitch-assignable Arabic setups, with ±99 cent tuning per note. ? DSP Effects The 60 DSP effects include reverb, delay, chorus, and more.