Doepfer

Hi,

I am finding that the A121 resonance level influences the cutoff frequency.
When the resonance level is swept up at self-oscillation levels, you can
hear it drop a few tones.  It's been a while since I've played it like this,
but I seem to remember it not doing that before (but maybe I was dreaming).
So is this behavior normal and expected, or is something wrong?

Thanks,
Monroe


[Non-text portions of this message have been removed]

--- In Doepfer_a100@yahoogroups.com, Monroe Eskew <monroe.eskew@...> wrote:
>
> Hi,
> 
> I am finding that the A121 resonance level influences the cutoff frequency.
> When the resonance level is swept up at self-oscillation levels, you can
> hear it drop a few tones.  It's been a while since I've played it like this,
> but I seem to remember it not doing that before (but maybe I was dreaming).
> So is this behavior normal and expected, or is something wrong?
> 
> Thanks,
> Monroe


i'm not 100% sure about this, but i think it could be normal.
i have to check it on mine, but mine is modded (hotter input)
and maybe responds a bit differently anyway.

dieter, maybe you can tell us more?

best wishes

ingo

Hi Ingo

I think this is partially "normal", especially in higher frequencies.

The Spec-Sheet of the CEM3320 also notes: that the resonance frequencies 
of the various filtertypes are different for the same values:
http://curtiselectromusic.com/uploads/CEM_3320_Long.pdf
Page 4, 2nd column.


You also may observe that the highpass becomes a littlebit bandpasss 
like in the higher frequencies. There is an modification to prevent 
this, this modification also removes this drop in cutoff - but the 
negative side of this modfication is, that the selfosciallation becomes 
a little uncontrollable in higher regions.

Florian

selfoscillate schrieb:

> 
> --- In Doepfer_a100@yahoogroups.com, Monroe Eskew <monroe.eskew@...> wrote:
>> Hi,
>>
>> I am finding that the A121 resonance level influences the cutoff frequency.
>> When the resonance level is swept up at self-oscillation levels, you can
>> hear it drop a few tones.  It's been a while since I've played it like this,
>> but I seem to remember it not doing that before (but maybe I was dreaming).
>> So is this behavior normal and expected, or is something wrong?
>>
>> Thanks,
>> Monroe
> 
> 
> i'm not 100% sure about this, but i think it could be normal.
> i have to check it on mine, but mine is modded (hotter input)
> and maybe responds a bit differently anyway.
> 
> dieter, maybe you can tell us more?
> 
> best wishes
> 
> ingo
>

thanks, florian :)


--- In Doepfer_a100@yahoogroups.com, Florian Anwander <fanwander@...> wrote:

>
> Hi Ingo
> 
> I think this is partially "normal", especially in higher frequencies.
> 
> The Spec-Sheet of the CEM3320 also notes: that the resonance frequencies 
> of the various filtertypes are different for the same values:
> http://curtiselectromusic.com/uploads/CEM_3320_Long.pdf
> Page 4, 2nd column.
> 
> 
> You also may observe that the highpass becomes a littlebit bandpasss 
> like in the higher frequencies. There is an modification to prevent 
> this, this modification also removes this drop in cutoff - but the 
> negative side of this modfication is, that the selfosciallation becomes 
> a little uncontrollable in higher regions.
> 
> Florian
> 
> selfoscillate schrieb:
> > 
> > --- In Doepfer_a100@yahoogroups.com, Monroe Eskew <monroe.eskew@> wrote:
> >> Hi,
> >>
> >> I am finding that the A121 resonance level influences the cutoff frequency.
> >> When the resonance level is swept up at self-oscillation levels, you can
> >> hear it drop a few tones.  It's been a while since I've played it like this,
> >> but I seem to remember it not doing that before (but maybe I was dreaming).
> >> So is this behavior normal and expected, or is something wrong?
> >>
> >> Thanks,
> >> Monroe
> > 
> > 
> > i'm not 100% sure about this, but i think it could be normal.
> > i have to check it on mine, but mine is modded (hotter input)
> > and maybe responds a bit differently anyway.
> > 
> > dieter, maybe you can tell us more?
> > 
> > best wishes
> > 
> > ingo
> >
>

Florian,

Do you know if the A106-6 does this too?

Thanks,
Monroe

On Thu, Dec 16, 2010 at 1:58 AM, Florian Anwander
<fanwander@mnet-online.de>wrote:

>
>
> Hi Ingo
>
> I think this is partially "normal", especially in higher frequencies.
>
> The Spec-Sheet of the CEM3320 also notes: that the resonance frequencies
> of the various filtertypes are different for the same values:
> http://curtiselectromusic.com/uploads/CEM_3320_Long.pdf
> Page 4, 2nd column.
>
> You also may observe that the highpass becomes a littlebit bandpasss
> like in the higher frequencies. There is an modification to prevent
> this, this modification also removes this drop in cutoff - but the
> negative side of this modfication is, that the selfosciallation becomes
> a little uncontrollable in higher regions.
>
> Florian
>
> selfoscillate schrieb:
>
> >
> > --- In Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>,
> Monroe Eskew <monroe.eskew@...> wrote:
> >> Hi,
> >>
> >> I am finding that the A121 resonance level influences the cutoff
> frequency.
> >> When the resonance level is swept up at self-oscillation levels, you can
> >> hear it drop a few tones. It's been a while since I've played it like
> this,
> >> but I seem to remember it not doing that before (but maybe I was
> dreaming).
> >> So is this behavior normal and expected, or is something wrong?
> >>
> >> Thanks,
> >> Monroe
> >
> >
> > i'm not 100% sure about this, but i think it could be normal.
> > i have to check it on mine, but mine is modded (hotter input)
> > and maybe responds a bit differently anyway.
> >
> > dieter, maybe you can tell us more?
> >
> > best wishes
> >
> > ingo
> >
>  
>


[Non-text portions of this message have been removed]

Hi Monroe

> Do you know if the A106-6 does this too?
I don't know it. But I think it is a dedicated behaviour of the 
Multimodefilter made with the CEM3320, which is used this way only in 
the A-121

Florian