Experiment with Collector filters

Try adding two filters on top of the usual AudioCollector:

* Minimum length preservation: never report fewer than N seconds worth
  of audio data. Pad with silence as needed.
* Volume normalizing: normalize audio volume.

Using my benchmark of 30-second audio clips from 3 speakers (lower is
better):

length enf + norm = 87.118
nothing = 90.917
norm = 94.538
length = 111.402

Both together are a slight improvement, but independently degrade the
result by a lot. I also observed more hallucinations in a conversational
pattern when using them vs. not. So I'll phase them out.

I'm still curious about *compression* as opposed to normalization.

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