hello nicolas,

during the weekend i tried to reproduce the vowel table
mentioned in the a127 manual, using an a127 pcb version 3.
i have to point out that these settings may vary from
module to module, due to component tolerances or
module revisions. use these values as a guide only
and tweak them to fit on your own a127.


ee
1 = 270 hz = 3,5
2 = 1990 hz = 6,4
3 = 3010 hz = 7


i
1 = 390 hz = 4
2 = 1840 hz = 6,2
3 = 2550 hz = 6,9


e
1 = 530 hz = 4,5
2 = 1720 hz = 6,1
3 = 2480 hz = 6,8


ae
1 = 660 hz = 4,9
2 = 1090 hz = 5,9
3 = 2410 hz = 6,7


ah
1 = 730 hz = 4,9
2 = 1840 hz = 6,2
3 = 2440 hz = 6,8


aw
1 = 570 hz = 4,6
2 = 1020 hz = 5,8
3 = 2410 hz = 6,7


u
1 = 440 hz = 4,1
2 = 870 hz = 5,2
3 = 2240 hz = 6,5


oo
1 = 300 hz = 3,6
2 = 1190 hz = 6
3 = 2240 hz = 6,5


a
1 = 640 hz = 4,8
2 = 1350 hz = 6
3 = 2390 hz = 6,6


er
1 = 490 hz = 4,3
2 = -
3 = 1690 hz = 6,1


best wishes

ingo





--- In Doepfer_a100@yahoogroups.com , "nicholas_kent"
<nicholas_kent@...> wrote:

>
> So far I've just played with it by ear.
>
> But I'm curious if anyone has already worked out tables or a

formula to center any one of the

> BP filters on a particular Hz. frequency.
>
> I was kind of annoyed the that doc for the A-127 reprints a table

from the Allen Strange book

> but doesn't list any approximate VCF Freq. knob settings nor

voltage amounts to set the filter

> to those frequencies.
>