Korg are and have always been a keyboard company, but during the 1980s and early 1990s they ventured into the world of digital effects processors quite successfully. Korg have made a number of excellent processors that appealed to studios, keyboard players and guitarists too. Their A3 processor is loved by guitarists, and made famous by The Edge from U2. But perhaps their greatest and mot loved product was the Korg SDD-3000 digital delay. They rarely come up for sale these days and not cheap when they do. Thankfully Korg have put it back into production in a pedal form.