The main voice is made from very clean digital dual waveform timbres those imitate FM and resemble very much the great Yamaha MK-100 from 1983, and like the latter it has even a trio mode ("auto harmony") for cheesy pop organ chords.
An unusual special feature of this instrument is the "playright mode", which switches the right keyboard section to pentatonic tone scales, those vary with the actual chord (selected with the left hand) to force the player to play what establishment considers harmonious (a bit like an Omnichord).
[[File:Amstrad CKX100.jpeg]] [[File:Amstrad CKX100 side.jpeg|400px]]