A friend is porting Flutini, the real time tuning analyser, to iPod. I recounted that I'd found it useful for checking concertina tuning, and that some concertina players have gone for quarter comma meantone rather than equal temperament, so that if he were intending to offer some temperaments, that would be a potentially useful one. He agrees but asks what root note the temperament should be centred on. Do we have a firm view on this?   Terry