For Margo -- a tuning to try

(I'm cc'ing MakeMicroMusic@yahoogroups.com because Jacky didn't respond to my post to the tuning list and I'm worried that Margo might also miss it)

Hi Margo,

Given your love of harmony based only on the primes 3 and 7, I thought this might be interesting to you -- I'm sure Gene will find many more, but it's something . . .

Take two keyboards, and tune each of them to 9-tET. Note that the 7:6 is essentially pure in 9-tET.

Now tune the keyboards a perfect fifth apart.

You now have nine of your cherished 12:14:18:21 chords, essentially just! Also, there are nine 100-cent steps -- familiar semitones!

I'd love to hear some crazy warped neo-Gothic music in this tuning.

Cheers,
Paul