Gene wrote: >There's a close relationship with periodicity blocks. Pick either major or minor tetrads, and with those, one >particular chord element--for instance the roots of the minor tetrads, or the major third element of the major >tetrads. These will all individually be corresponding Fokker blocks. I see, sort of a Carthesian product of a Fokker block with a chord then? >Where is the 4:5:6:7 double tied circular mirroring discussed? I wrote a posting to the Tuning List several years ago, I can't find the specific date at the moment. In the scala archive they are the scales *kring*.scl. In a double tied circular mirroring a chord is inverted repeatedly with two tones in common each time with the next inversion, until coming back to the original. They are closely related to Partch diamonds. Manuel ------------------------ Yahoo! Groups Sponsor ---------------------~--> Save on REALTOR Fees http://us.click.yahoo.com/Xw80LD/h1ZEAA/Ey.GAA/wHYolB/TM ---------------------------------------------------------------------~-> To unsubscribe from this group, send an email to: tuning-math-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ ____________________________________________________________ To learn how to configure this list via e-mail (subscribe, unsubscribe, etc.), send a message to listar@xxxxxxxxxxxxx with the subject line "info tuning-math". Or visit the website: < //www.freelists.org/list/tuning-math > .