Re: Multichannel to Stereo in Logic
Re: Multichannel to Stereo in Logic
- Subject: Re: Multichannel to Stereo in Logic
- From: Brian Willoughby <email@hidden>
- Date: Wed, 27 Oct 2010 03:18:51 -0700
It seems to me like in all cases you are combining two signals into
one, whether two mono signals to one mono output or two stereo
signals to one stereo output. At least that's the case unless your
four inputs are not actually two stereo inputs.
In terms of both Logic and AudioUnit API, a sidechain (Logic) i.e.
additional bus input (AU) would be appropriate. You have the
flexibility of making the sidechain bus mono or stereo.
If your 4 inputs are not 2 stereo signals, then I don't understand
how you expect this to fit into Logic. Logic has support for mono
inputs, stereo inputs, and surround inputs. If you have 4 signals
which need to feed one plugin because they are part of the same
signal, yet they are not surround, then you have signals which Logic
is not designed to handle.
I realize that Logic is a very popular host, and you really don't
want to offer a plugin which doesn't work smoothly with Logic, but so
far you've either described a situation which already makes sense
with sidechains or doesn't make sense with Logic at all. Logic
simply does not offer any features for downmixing from a larger
number of channels per signal to a smaller number (to my knowledge).
However, I suggest that you not dismiss the capabilities of the
AudioUnit API outside of Logic. If there is really a demand for your
plugin, then there is a demand for a host which does support the kind
of 4-to-2 signal downmixing that you require, and thus there is a
demand for a different kind of AU host than Logic.
Brian Willoughby
Sound Consulting
On Oct 27, 2010, at 02:59, Stefan Huber wrote:
Thanks for all your replies. It's difficult for me to be too
specific about the plug-in since the topic is complex and I am not
sure how much I am allowed to publish at the moment. What I can say
is that I need to input two (microphone) signals for the mono
version of the plug-in. So there are two equally important signals
fed into the plug-in. These two signals are combined to one -
therefore, I need one output. Of course, Stereo output with 2
equal signals would be fine.
For the stereo version of that plug-in, I will need 4 inputs and 2
outputs. At that point there are 2 possibilities: Creating a
mechanism to sync the settings of 2 mono instances of the plug-in
in order to allow stereo processing - or use a plug-in with stereo
output and 4 inputs.
Feeding 2 inputs into the sidechain seems like a workaround for me,
since sidechain inputs are usually not used that way. Providing 4
real inputs would be more adequate. But telling customers that they
need to switch their host just in order to use your plug-in doesn't
seems like good marketing strategy to me. Cubase people have dealt
with sidechain processing using real inputs as a workaround for
years, before VST3 came out and some people finally started to
support it.
My question has been targeted more to logic than the capabilities
of the AU-API. Is there a way to use a plug-in with 4 inputs in
logic, without having to switch to surround mode (which would make
it impossible to use stereo plug-ins on your master and after the
plug-in) and not using sidechain as inputs?
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