Reply to Polychroni

>Recall, that our chanter, if chanting without the instrumental
>accompaniment could not sing Al Sibn's intervals to begin
with--being
>unable to accurately judge the size of the 88/81 step. He might
>sing,
>instead, 9/8, 12/11, 13/12 (cumm=9/8, 27/22, 117/88 = 204c, 355c,
>493c).
>This would be heard by him and his audience as 9/8, 11/9, 4/3). So
>this
>too, is equivalent.

Unless he underwent extensive training with an instrument, I doubt
our
chanter could or would accurately produce 12/11 or 13/12 steps
unaccompanied.