Re: Persian musical koron and sori

[Hans Aberg]

On 16 Feb 2009, at 03:48, Kees van den Doel wrote:

> The note immediately  following a koron is sometimes  (when the  
> interval
> defined by  the note  before the koron  and after  the koron is  a  
> minor
> third, and the note below the  finalis in esfahan according to some  
> (but
> not all)  Persian musicians))  lowered by about  20 cents.  This  is  
> not
> notated, but considered part of the scale tuning. To accomodate this  
> for
> getting better sounding  MIDI I've introduced the "vlat"  (append  
> 'v' to
> the note) to indicate this. Actually  this note should also get a  
> strong
> vibrato,  and the  vibrato and  low tuning  are  perceptually  
> integrated
> (serialism!).

I think there may be no need for special note for this, as it merely  
indicates a cancellation of the intermediate pitch relative the  
diatonic notation system. That is lowering a note with a koron this  
way is the same as writing it with a sori and cancel it. This is in  
fact how Hormoz Farhat writes it, like for the note below the finalis  
in Dastgah-e Bayat-e Esfahan. It will work in any tuning, also E53  
(Pythagorean tuning).

Details with your cent values:

The sum of the koron and sori intervals are always equal to M-m. Since  
you have decided to use E12, M-m = 100 cents. And you set the koron  
lowering 30 cents, and the sori raising 20 cents. So lowering a note  
with a koron with 20 cents is the same as writing it with a sori and  
canceling it.

  Hans