Mr.Just from Seydel tunes the Soul's voice indeed close to equal temperament.. It's a compromise tuning as I could see on the sheet he uses . I watched this during the Klingenthal festival 2 weeks ago. I've never seen anyone tune a harp that fast...it's a pleasure to see how this man does his job (on all kind of harps!). Ben Bouman Holland www.marbletones.com