Most modular VCAs, such as A131, are actually only attenuators. The
amplitude of an ipod signal is much less than a VCO and would thus need to
be stepped up to be in the same range as a VCO. The forthcoming A183
amplifies signals, and the already available A133 also amplifies. You can
get one of these but an immediate solution would just be to adjust levels on
your main amp/PA. For example I use a PA designed for keyboards that has
multiple inputs with independent level controls, and if I want to play my
analog synth at the same time as an mp3, then I'd just put the synth line
level really low compared to the mp3 line.
Monroe

On Sat, Aug 15, 2009 at 10:34 AM, Greg Cerveny < greg.cerveny@... >wrote:

>
>
> Hey Sandy,
>
> I tried putting it through an a-131 to bring the level up, do you
> think that would be enough
>
> Curiously, why would an a-120 and an a-106-5 would filter the source
> untreated, but the a-121 need it amplified
>
> Thanks! I'm still new to this and trying to figure it all out.
>
> -Greg
>
>
> On Sat, Aug 15, 2009 at 11:01 AM, Sandy Brain< sandybrain@... <sandybrain%40gmail.com>>
> wrote:
> >
> >
> > are you using an external input module of some kind to bring the
> > external input up to 'modular" levels
> > if not, i'd say that's your problem.
> >
> > On 15 Aug 2009, at 17:32, Greg Cerveny wrote:
> >
> >> I'm really confused on this one.
> >>
> >> I have an a121 multimode filter that doesn't filter external sources.
> >> At first I thought the filter was not functioning at all. The
> >> resonance will self oscillate and allow hints of what was coming in
> >> from the external source. Then, I patched it in a conventional synth
> >> path.
> >>
> >> This works:
> >>
> >> When I patch it in vco -> a121 -> vca, it modifies the sound as
> >> intended (hp/lp/bp/notch).
> >>
> >> These don't:
> >>
> >> When I patch in external source (drum machine/iphone) -> a121, I
> >> barely get anything. The same if I patch ext source -> vca -> a121 or
> >> ext source -> vca -> a121 -> vca.
> >> When I have more complex sources like vco -> vca -> bbd (188-2) ->
> >> a121, the result is the same as the external source.
> >>
> >> Conclusion:
> >>
> >> It only seems to filter when I send in simple wave forms from a vco.
> >>
> >> Notes:
> >>
> >> My other filters (a120/a106-5), allow me to patch in external sources
> >> (iphone/drummachine) and work as expected.
> >>
> >> Is there something unique about the a121 and complex wave forms that
> >> I'm missing Is my a121 toast
> >>
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
>
>


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