Re: Audio Units and Multi-mono in Logic 8
Re: Audio Units and Multi-mono in Logic 8
- Subject: Re: Audio Units and Multi-mono in Logic 8
- From: "Sophia Poirier [dfx]" <email@hidden>
- Date: Thu, 24 Jul 2008 16:51:41 -0400
Bill,
I'm referring to a feature added to Logic in version 8 (and also
basically the same thing exists in Pro Tools) where, if you have a 5.1
surround track and you want to add an effect to it that supports mono
operation but not 5.1, then Logic will allow you to load a "multi
mono" instance of that plugin (it will show up in a sub-menu for the
plugin labeled "multi mono"). In multi-mono mode, there are 6
instances of the plugin loaded, all configured to mono operation, and
then Logic shows you the GUI for one of them and any changes made to
that one are synced with the other 5, so that you get control of them
all based on one instance. So it's a workaround for plugins that have
(probably unnecessarily) no support for surround operation.
If that were the extent of the behavior, it would not be useful to
offer as an option for plugins that already support 5.1 surround
operation. However, Logic's implementation also allows you to start
separating control between channels (up to 3 separate ways I think) so
that you can have one instance's GUI controlling 3 of the channels,
another controlling 2 of the channels, etc. So that's where it
becomes something that is useful in its own right, and that's why I
think it should be offered as an option even if a plugin does support
surround operation. Which, again, is something that Pro Tools does
offer, recognizing that it can still be useful.
Sophia
On Jul 24, 2008, at 3:18 PM, William Stewart wrote:
Sophia
I'm not sure exactly what you mean by "multi-mono"
On Jul 24, 2008, at 9:12 AM, Sophia Poirier [dfx] wrote:
On Jun 25, 2008, at 4:07 PM, Matthew Morton wrote:
I have an AU with a class, myClass that is derived from
AUEffectBase.
ProcessBufferList() is overridden so that one of two processes may
occur; Firstly, if(inBuffer.mNumberBuffers == 1) then a mono
version
of the processing algorithm is run. The other option runs for all
other inBuffer.mNumberBuffers , and this is a stereo version of the
algorithm. Now, I could implement a third algorithm for when there
are 6 channels, assuming 5.1 surround audio, and in fact I have
and it
works fine. However, I thought it would be interesting to have my
AU
work in the multi-mono mode within Logic to give the user further
control. My question really is relating to how Logic knows how to
implement a plugin as a 5.1 or Multi-mono version; what are the key
parts involved here? Any help from others who have done this
themselves would be great. Thanks very muchly!
From what I can deduce, Logic will present a 5.1 version if the
plugin claims it will support that (via its implementation of
SupportedNumChannels), and if not (and if the plugin does support
mono operation) then it will present the plugin as multi-mono.
I agree with you that Logic should still make the multi-mono option
available for surround- and mono-capable plugins. There are
reasons why multi-mono can sometimes have its own advantages. Pro
Tools allows for both options. I submitted an enhancement request
for this to Apple back in November 2007, though others should too
if they agree it's important since more reports gets bugs noticed
more. :)
http://bugreport.apple.com/
- Sophia
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