Doepfer

Best regards, Karel.

Hello Karel, 

I would say, try without the a138b and hear the result. 

Best regards

Jacco Ville
The Netherlands

Verstuurd vanaf mijn iPhone SE Lunatik 

> Op 16 jul. 2016 om 06:13 heeft karelvanbezooijen@yahoo.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> het volgende geschreven:
> 
> I have this "issue". I don't know if it is Doepfer related but I thought this may be the place to start my investigation.
> 
> I put a short movie on my YouTube channel.
> 
> 
> https://youtu.be/b3JF4wtP8lE
> 
> 
> 
> Best regards, Karel.
> 
>

Hello Karel,

I assume the serge module is not buffered very well, so its input 
creates an lowpass together with the output of the A-138.
I suggest the following test.

A-111 -> A-138 -> multiple

connect cubase with the multiple. Check the waveform and the frequency 
range.

Then connect the SSG to the multiple too (cubase still connected to the 
multiple). Check the waveform and the frequency range again. I assume 
there will be a drop in the high frequency range. If yes, blame it to 
the SSG.

regards
Florian

Am 19.07.2016 um 07:30 schrieb karelvanbezooijen@yahoo.com [Doepfer_a100]:
> Again no difference in freq or on the scope
Ok, then try to put some other module (which should be in a kind of 
bypassmode) between the A-138 and the SSG. Like:

A-111 -> A-138 -> otherModule -> SSG -> Cubase

This "other Module" might be a highpass filter with the cutoff frequency 
turned fully anticlockwise or a VCA with gain turned fully up.

Hopefully the naming convention I used is clear. Otherwise please ask.

MAVCA = Manhattan Analog VCA.

Hi Karel,

compare:
A111-A138(FullOpen)-SSG-Cubase
with
A111-MAVCA(FullOpen)-SSG-Cubase

You see, that in both cases the high frequency level drops.

So now it is clear:
The cause is NOT the A-138, because the same behaviour can be seen with 
a non-Doepfer-module too.
The problem is caused by the SSG. I assume its input behaves with the 
output circuit of the other modules like a lowpass. This is assumingly a 
concept fault of the SSG circuit. I don't know the schematics of the 
SSG, so I cannot tell details. But your tests proove it.

Florian