After reading a little more, I have some more thoughts: It seems you COULD use something like a Peterson, as long as you'd do the stretching manually. You could tune in the order you'd tune aurally, with the machine's help, and use the ETD to help you put the right stretch in by tuning to the appropirate harmonic. That way you have complete control over what kind of octaves you're getting. Alternatively, you could calculate your own tuning curve with a fancy programmable calculator, based on some manual inharmonicity measurements that you'd take. I'm curious: Did Al Sanderson publish his algorithm for calculating the tuning curve based on FAC? Or is that secret info? I realize that while it seems you CAN do the stretching calculations manually, the more advanced ETDs save time by doing it for you. But I'm not convinced that the better ETDs would necessarily do a better job. If you had the right program running on a fancy programmable calculator or pocket PC, I think you could end up with just as good a tuning curve. Now all I have to do is try it... Charles
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