G'day JohnInKansas,

The OT-12 sounds like the latest equivalent of the 'special' model, back in Korg's analog days, that even had specific scales for Japanese traditional instruments. Just a bit more than I can justify ... If I want to tune an instrument to a purer-interval scale (say a 20-key concertina to mean tone scale ... very nice harmonies ... as long as you can't get into any distant keys!) I would just use an adjustment table ... reading how far each note should be from tempered.

As regards the prices ... well, it's a long swim to a small market ... ?

Regards,

Bob Bolton