This came up in another forum and I wondered if you had ever used this or knew any fretless (solo?)bass players had used this - I seem to remember that Michael Manring experimented with micro-tonality but couldn't remember whether he had looked into this? I only know about it because of the series on Channel 4 this year on the history of Music, which looked at 5 big things which had changed the face of music. One of the programmes was devoted to the way that Equal Temperament was adopted by the West from Bach's time onwards and had almost wiped out every other type of tuning now. I know that "Just Temperament" means that each key would have a different sound and notes would be tuned differently depending on the intervals, so that an F# will be slightly differently to a Gb for example - is it just impractical or something worth experimenting with?