Re: [ecasound] interaction of -eac and -erc

On Mon, 4 Jul 2005, Eric Dantan Rzewnicki wrote:

> In a multichannel chain where every channel but 1 is a copy of channel 1 what
> is the effect of an -eac:0,1 on channels 1+n?

A good question, let's see..

> psuedo example chain:
> ecasound -i:foo_mono_input -f:32,4,48000 -o:foo_quad_output \
> -eac:0,1 \
> -erc:1,2 -eac:100,2 \
> -erc:1,3 -eac:100,3 \
> -erc:1,4 -eac:100,4
>
> will channels 2-4 be silent because -eac:0,1 sets amplitude of channel 1 to
> zero before it gets copied to the other channels?

Yes. Ecasound sets the chain channel count before starting processing. It
is set to the maximum of max(in-channels,out-channels). During processing,
order of eac/erc ops defines the end result.

> or would the other channels get copies of channel one from before the -eac?

No, no implicit copying is done.

> I'm guessing the former ...

And you guessed right! :)

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