ET and EDO?

--- On Sun, 4/18/10, cameron <misterbobro@...> wrote:
--- In tuning@yahoogroups. com, Mike Battaglia <battaglia01@ ...> wrote:
> >
> > OK so, by that same logic, so is 31-et.

> Nope, because then you've changed it into 1/4 comma meantone. 31 is not
> inherently a cycle of 4th-root-of- 5, mod2. Perhaps everything would have
> been more immediately obvious if I'd said 31-edo, a much better term in
> this case.

Whats the difference between ET and EDO?
(Sorry for a tuning noob question but google seems to say they are the same...)

EDO is an acronym for equal division of the octave, and came about to define
what was being equally divided, there being some work done in scales that
equally divide other interals, such as the 12th, in the equal version of
bohlein-pierce. In practice they mean the same thing.

On Sun, Apr 18, 2010 at 8:33 AM, Rustom Mody <rustompmody@...> wrote:

>
>
> --- On Sun, 4/18/10, cameron <misterbobro@...<misterbobro%40yahoo.com>>
> wrote:
> --- In tuning@yahoogroups. com, Mike Battaglia <battaglia01@ ...> wrote:
> > >
> > > OK so, by that same logic, so is 31-et.
>
> > Nope, because then you've changed it into 1/4 comma meantone. 31 is not
> > inherently a cycle of 4th-root-of- 5, mod2. Perhaps everything would have
>
> > been more immediately obvious if I'd said 31-edo, a much better term in
> > this case.
>
> Whats the difference between ET and EDO?
> (Sorry for a tuning noob question but google seems to say they are the
> same...)
>
>
>

I typically only use ET or tET to refer to EDOs which have some relation to meantone or pythagorean temperament (i.e., they have close approximations to a Just 3/2 ratio). Metatunings like 11-EDO and 23-EDO don't approximate 3/2 well (if they can even be said to approximate it AT ALL), so calling them "equal temperaments" seems misleading (though you could technically describe them as just "really exaggerated" temperaments). Really, there isn't a strong technical difference between ET and EDO, just an aesthetic one.

--- In tuning@yahoogroups.com, Cody Hallenbeck <codyhallenbeck@...> wrote:
>
> EDO is an acronym for equal division of the octave, and came about to define
> what was being equally divided, there being some work done in scales that
> equally divide other interals, such as the 12th, in the equal version of
> bohlein-pierce. In practice they mean the same thing.
>
> On Sun, Apr 18, 2010 at 8:33 AM, Rustom Mody <rustompmody@...> wrote:
>
> >
> >
> > --- On Sun, 4/18/10, cameron <misterbobro@...<misterbobro%40yahoo.com>>
> > wrote:
> > --- In tuning@yahoogroups. com, Mike Battaglia <battaglia01@ ...> wrote:
> > > >
> > > > OK so, by that same logic, so is 31-et.
> >
> > > Nope, because then you've changed it into 1/4 comma meantone. 31 is not
> > > inherently a cycle of 4th-root-of- 5, mod2. Perhaps everything would have
> >
> > > been more immediately obvious if I'd said 31-edo, a much better term in
> > > this case.
> >
> > Whats the difference between ET and EDO?
> > (Sorry for a tuning noob question but google seems to say they are the
> > same...)
> >
> >
> >
>

> Whats the difference between ET and EDO?
> (Sorry for a tuning noob question but google seems to say they are the same...)

Anybody would guess they mean the same thing, but whether you call something an ET or EDO depends on many factors including: how you feel that day, what you had for breakfast, and indeed what colour socks you are wearing.