[linux-audio-user] LADSPA SC2, SC3 Compressors and Sidechain

Steve Harris S.W.Harris at ecs.soton.ac.uk
Sat Feb 14 06:52:55 EST 2004


On Fri, Feb 13, 2004 at 11:09:10PM -0800, Russell Hanaghan wrote:
> On Thu, 2004-02-12 at 22:56, Russell Hanaghan wrote:
> > I could not get any noticeable function trying the sidechain inputs of
> > these (I forget if it was specifically SC2 or 3 or 4 but could see the
> > inputs in Jack-Rack)
> > 
> > I ran jack from Qjackctl, Ardour and jack-rack. Inserted SC3 into
> > jack-rack. All routing was done from Qjackctl "Connect" interface. Tried
> > every way to Sunday and could not get any effect except "makeup gain".
> > Then I tried just patching SC2 then SC3, etc as inserts direct into an
> > audio channel in Ardour for straight compression. Could not get them to
> > do any standard compressing either.
> > 
> > Any thoughts or illumination on these compressors would be great. I
> > particularly want to run a "de essing" of sorts on a single mike imput.
> > Is it possible with these plugs??
> > 
> > Thanks
> 
> No takers??

Sorry, must have missed it first time tound. They do work (SC4 is used in
JAMin), try setting low attach and decay times, winding the threshold right
down the ratio right up and the knee to the middle and the peak/rms to
peak.

If your audio is comming in at quite a low level you may not hear anything
- this is a thinko on my part, analogue compressors expect signals > 0dB,
but in digital systems this is unusual, so the range of the threshold is a
bit narrow. A future release will have a lower min range.

- Steve



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