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

Joern Nettingsmeier nettings at folkwang-hochschule.de
Sat Feb 14 15:20:58 EST 2004

Russell Hanaghan wrote:
> On Sat, 2004-02-14 at 03:52, Steve Harris wrote:
>>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??
>>>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
>>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
> Thnx Steve..
> What about the side chain inputs...Any info on how to use them as I
> described? Like as de essing with pushed freqs from a seperate eq?

i have not used scX's sidechains yet, but there is a quite nice 
dedicated de-esser in the new TAP LADSPA package. it has some 
problems at some settings (peaking setting did not work for me, but 
low-pass did), but can be made to work rather nicely if you choose 
the setting carefully.




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Jörn Nettingsmeier
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