Doepfer

Thank you. I posted earlier some comments. I think I understand the 
parameters now.

Best regards
Jari Jokinen

--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:
>
> The waveform pictures in the A-137 user's manual are idealized 
graphs and
> used only to explain the basic function of the module. In reality 
the
> clipping and folding is not hard (as shown in the pictures) but 
soft.
> Finally the audible result is important but not the scope picture. 
You will
> find more idealized graphs in other manuals too. Showing the "real"
> waveforms, frequency response curves or other parameters would 
complicate
> the explanations.
> 
> In the A-137 the combination of the four parameters (multiples, 
folding
> level, symmetry and harmonics) define the output waveform. You 
should obtain
> a triangle output (with A-110 triangle as input) with these 
approximate
> settings:
> 
> audio input level ~ 2
> multiples = 0
> folding level = 0
> symmetry ~ 3 (between 9 and 12 o'clock)
> harmonics ~ 2 (~ 9 o'clock)
> 
> Starting from this setting you should be able to see the functions 
of the
> four parameters very good at the scope.
> 
> Your settings are far away from generating a triangle at the output 
(with
> input level at 12'o clock and multiples at 9'o clock you have 
already some
> multiplications).
> 
> Best wishes
> Dieter Doepfer
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von jalmari3
> > Gesendet: Mittwoch, 15. August 2007 19:49
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] Is my A-137 faulty?
> >
> >
> > I can't duplicate the folded triangle waveforms shown in the A-137
> > manual (chapter 2). The shown waveforms consist of straight 
lines, but
> > I get rounded waveforms.
> >
> > Here is an example oscilloscope view:
> > http://www.esnips.com/doc/278f44e2-ce2a-4ff1-8f17-1f7ef5d795d7/A-
> > 137_weirdness_1
> > (I hope the link isn't too long for Yahoo.)
> > The settings are:
> > - All CV inputs at full counter clockwise and unplugged
> > - Input level at 12'o clock
> > - Multiples at 9'o clock
> > - Folding level at 12'o clock
> > - Symmetry at 12'o clock
> > - Harmonics at full counter clockwise
> >
> > Questions:
> > - Is this the expected output on these settings
> > - Why does a triangle input get rounded?
> > - What settings should give the straight line waveforms shown in 
the
> > manual?
> >
> > Best regards and thank you for your time
> > Jari Jokinen
>