[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??
>>>>
>>>>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
> 
> 
> 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.

http://tap-plugins.sourceforge.net/

regards,

jörn

-- 
The handles of a craftsman's tools bespeak an absolute simplicity,
the plainest forms affording the greatest range of possibilities for
the user's hand.
That which is overdesigned, too highly specific, anticipates
outcome; the anticipation of outcome guarantees, if not failure, the
absence of grace.
         - William Gibson, "All Tomorrow's Parties"

Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxaudiodev.org (Linux Audio Developers)






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