MOTM

OK - hope I can explain this clearly.

I have 2 MOTM 440 LPF's for stereo filter mangling.

I have a stereo synth pad going from Pro Tools to the 440's thus:

Left signal > 440 #1
Right signal > 440 #2

I have a slowish Tri LFO from MOTM 320 feeding CV In 1 of both
440's via a multiple. 440 #1 CV IN 1 knob set to slight negative, 440 
#2 CV IN 1 knob set to slight positive. This is for nice subtle 
stereo panning.

OK so far. Then I wanted to manually sweep the freq's of both filters 
simultaneously... so using 2 banana to 1/4 jack adapters on my Serge, 
I patch the Serge Processor into CV IN 2 of both 440's. 

Using the -/+5v knob of the Serge Processor I can attenuate both 
440's simultaneously right?

Yes - BUT this is working differently on each 440! I can only get it 
to work on both filters by setting 440 #1 CV IN 2 knob to fully 
clockwise BUT 440 #2 only works the same if I set its CV IN 2 knob 
fully counter-clockwise!!

Which filter is behaving correctly??

Kirk

>Yes - BUT this is working differently on each 440! I can only get it
>to work on both filters by setting 440 #1 CV IN 2 knob to fully
>clockwise BUT 440 #2 only works the same if I set its CV IN 2 knob
>fully counter-clockwise!!
>
>Which filter is behaving correctly??

I'm no electrical engineer, but I'd guess the one that doesn't have 
the pot wired backwards.  I'd check the assembly instructions.

Hi Mark

thx... however this came factory assembled from MOTM... surely not! :-0

kd

> >Yes - BUT this is working differently on each 440! I can only get it
> >to work on both filters by setting 440 #1 CV IN 2 knob to fully
> >clockwise BUT 440 #2 only works the same if I set its CV IN 2 knob
> >fully counter-clockwise!!
> >
> >Which filter is behaving correctly??
> 
> I'm no electrical engineer, but I'd guess the one that doesn't have 
> the pot wired backwards.  I'd check the assembly instructions.
> 
>

Right.  CV IN 2 on the MOTM-440 is labelled "FM 2".  When fully
counter-clockwise it should be off.  Check the wiring if it isn't.

-Richard

> >Yes - BUT this is working differently on each 440! I can only get it
> >to work on both filters by setting 440 #1 CV IN 2 knob to fully
> >clockwise BUT 440 #2 only works the same if I set its CV IN 2 knob
> >fully counter-clockwise!!
> >
> >Which filter is behaving correctly??
>
> I'm no electrical engineer, but I'd guess the one that doesn't have
> the pot wired backwards.  I'd check the assembly instructions.
>

On 6/5/03, Kirk Degiorgio put forth:
>Hi Mark
>
>thx... however this came factory assembled from MOTM... surely not! :-0

If they are behaving differently, and all you are using is a simple 
mult (and not some sort of multiple attenuator), and your cables 
aren't screwy, then they would have to be built differently somehow. 
Afaik, they are assembled by hand and nobody is perfect.  I don't 
know what documentation comes with the assembled modules, but perhaps 
the correct wiring is shown on the schematic.

>  > >Yes - BUT this is working differently on each 440! I can only get it
>>  >to work on both filters by setting 440 #1 CV IN 2 knob to fully
>>  >clockwise BUT 440 #2 only works the same if I set its CV IN 2 knob
>>  >fully counter-clockwise!!
>>  >
>>  >Which filter is behaving correctly??
>>
>>  I'm no electrical engineer, but I'd guess the one that doesn't have
>  > the pot wired backwards.  I'd check the assembly instructions.