Subject: RE: [linux-audio-dev] Re: Sidechains, was Re: [linux-audio-announce] [ANN] swh-plugins 0.3.4
From: Mark Knecht (mknecht_AT_controlnet.com)
Date: Fri Jan 10 2003 - 19:21:38 EET
Steve,
Sorry for being dense on side-chain issues, but I've shied away from
using these specific plugins inside of Ardour since I seem incapable of
figuring out on my own how the side chain gets hooked up within that
application. Is this an Ardour issue, or am I just missing some simple piece
of info that makes it obvious?
Nominally I though the term 'sidechain' in a compressor referred to the
control signal that drives the VCA. (Or VCA software equivalent.) Many
hardware and compressors have a 'sidechain insert point' where you can apply
additional processing beyond whatever the RMS/peak detectors in the
compressor do themselves. (Or possibly even bypass those and use other
signal sources?) Many compressors (both software and hardware) allow you to
monitor the sidechain signal in some way to get better control over the
compressor. (Waves)
I must admit publicly that within the Linux application environment that
right now I'm pretty lost on how all these apps are using sidechain
controls. Often when I admit I'm lost, one or two other lost souls come
forward and suggest they are a bit lost also.
Taking Ardour as and example, when I insert an SC2 or SC3, where are the
sidechain controls coming from? Inside the compressor (expected) or from
some insert that I'm not hooking up correctly (possibly) or elsewhere?
Again, sorry for being so dense...
Thanks,
Mark
> -----Original Message-----
> From: linux-audio-dev-admin_AT_music.columbia.edu
> [mailto:linux-audio-dev-admin_AT_music.columbia.edu]On Behalf Of Steve
> Harris
> Sent: Friday, January 10, 2003 2:58 AM
> To: Linux-audio-dev
> Subject: [linux-audio-dev] Re: Sidechains, was Re:
> [linux-audio-announce] [ANN] swh-plugins 0.3.4
>
>
> On Fri, Jan 10, 2003 at 11:32:06 +0100, Robert Jonsson wrote:
> > >Not in practice, each compressor will want to extract
> different features
> > >from the audio stream.
> >
> > Okay, I see. The only solution, apart from actually sending the audio
> > data, which doesn't sound that nice to me, would be to make the
> > sidechain specifically designed for a certain plugin then (plugin
> > specific logic placed in the sidechain), which isn't that nice either.
> > But maybe it can be done such that other plugs can benefit
> also, i still
> > want to control that room-size !! :)
>
> Well, theres nothing to stop you from having a reverb with an audio rate
> room size control.
>
> The problem with using control ports is that most hosts aren't able to
> connect control outs to control ins.
>
> Sending audio around is not really much nastier than sending control data
> anyway.
>
> - Steve
>
>
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