Sorry, it's an external one indeed from the famous [Steve Harris 
plugins](http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html) (swh-plugins 
package) :
```
$ liquidsoap -h ladspa.gate

Gate by Steve Harris <steve(at)plugin.org.uk>.

Type: (?id:string,?attack:'a,?decay:'b,?hf_key_filter:'c,
 ?hold:'d,?lf_key_filter:'e,?output_select:int,?range:'f,
 ?threshold:'g,source(audio='#h,video='#i,midi='#j))->
source(audio='#h,video='#i,midi='#j)
where
  'a, 'b, 'c, 'd, 'e, 'f, 'g is either float or ()->float

Category: Source / Sound Processing

Parameters:

 * id : string (default: "")
     Force the value of the source ID.

 * attack : anything that is either float or ()->float (default: 250.007507324)
     Attack (ms) (0.01 <= <code>attack</code> <= 1000).

 * decay : anything that is either float or ()->float (default: 2001.)
     Decay (ms) (2 <= <code>decay</code> <= 4000).

 * hf_key_filter : anything that is either float or ()->float (default: 21609.)
     HF key filter (Hz) (220.5 <= <code>hf_key_filter</code> <= 21609).

 * hold : anything that is either float or ()->float (default: 1500.5)
     Hold (ms) (2 <= <code>hold</code> <= 2000).

 * lf_key_filter : anything that is either float or ()->float (default: 
30.8699989319)
     LF key filter (Hz) (30.87 <= <code>lf_key_filter</code> <= 4410).

 * output_select : int (default: 0)
     Output select (-1 = key listen, 0 = gate, 1 = bypass) (-1 <=
     <code>output_select</code> <= 1).

 * range : anything that is either float or ()->float (default: -90.)
     Range (dB) (-90 <= <code>range</code> <= 0).

 * threshold : anything that is either float or ()->float (default: -70.)
     Threshold (dB) (-70 <= <code>threshold</code> <= 20).

 * (unlabeled) : source(audio='#h,video='#i,midi='#j) (default: None)

```

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