Selling this very rare SK-8A in excellent, perfectly working condition.

The Casio SK-8A was an obscure variant of the SK-8 released in Arabian language countries and likely constitutes the world smallest oriental keyboard. Additionally to the functions of the normal version it had the "scale" slider with that any of the 12 octave semitones can be shifted up or down by a quartertone. 

To edit the tone scale, set the "scale" slider to the 1st "SET" position and press the keys for all octave tones you want to shift a quartertone up (indicated by a bongo sound), or slide it to the 2nd "SET" position and do the same to set octave tones a quartertone down. Then set it to "ARABIC" to play the edited scale. In this mode also the "slow rock" and "waltz" rhythm is replaced by the 2 oriental rhythms "baladi" and "romba junubi". Also the other 2 oriental rhythms (majroor, adani) may be useful for tribal-like tekkno. In opposite to the modded SK-8, the real Casio SK-8A has a different preset sound set (piano, pipe organ, trumpet, clarinet, violin, qanun, oud, nay) that has sounds in different order and includes 3 changed preset sounds due to different ROM. 

This upgraded instrument is not only good for oriental music, but sounds very anti-establishment and partly reminds (depending on your own warped tone scale) to Atari 8-bit POKEY music. (Remember, you can sample what you want and play it in that scale.)