help with Side Chain Compression

hollunder at hollunder at
Sun Sep 28 08:54:34 BST 2008

On Sat, 27 Sep 2008 23:15:10 -0400
"adam faranda" <adam.faranda at> wrote:

> I noticed that there are four LADSPA plugins, named "SC1, SC2, SC3,
> and SC4", which I am hoping different types of side chain
> compressors. I was experimenting a little with SC3, but I couldn't
> get any noticeable results; here's what I did:
> I created two tracks, a simple bass line, and a kick drum track with
> the kick drum pounding on the down beat.
> I waned to use the steady One Two Three Four of the kick drum as the
> side chain, applying compression to the bass track.
> I loaded the two tracks into Ardour, and used Jack Rack to host the
> plugin. SC3 has three inputs. Two of these, I assume,
> are for the left and right channels and the third, I believe is for
> the side chain. Conveniently, all three of these inputs appear
> in Patchage, so I was able to experiment pluging the drum track and
> bass track into different inputs. However I couldn't detect any
> noticeable difference
> in the sound of the bass track no matter what arrangement I used.
> I was wondering if anyone had experience with these plugins, or knew
> of a better (JACK friendly !!!!! ) way to do side chain compression

I believe someone did this in a hackish manner entirely in ardour, you
should be able to find that in the ardour forums. I believe I have read
that it should be possible with jackrack without that hackish stuff but
I've never tried it.

Best regards,

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