[PD] number of soundcard channels and cpu cost

Alexandre Torres Porres porres at gmail.com
Sat Apr 18 07:03:48 CEST 2015

Hi there, recently, I had to use the adat outputs of my audio card in Pd,
but these channesl are from 16 to 24 (they skip all the analog outs plus
some other things like SPDIF). My question is, if I ask Pd to work with
that much audio outputs (24 of them), but only use a couple of outputs
(like [dac~ 17 20] for example), is it more expensive on the CPU compared
to if I only have 2 outputs and use [dac~ 1 2]?

In short, does the cost depend only in the number of outputs in a [dac~]

Moreover, does the number of [dac~] objects make a difference? For
instance, having one [dac~] with many outputs costs the same as different
[dac~] objects for each output?

I always had the idea that too many outputs could really mean a lot more
cpu cost, but I'm not sure now if that cost is really real or relevant.
what do you say?

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