Re: [ecasound] Synchro saga: some background

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Subject: Re: [ecasound] Synchro saga: some background
From: Roy Cutler (
Date: Mon Mar 19 2001 - 03:07:09 EET

On Sunday 18 March 2001 10:15, you wrote:
> > ecasound -r -i:/dev/dsp0 -o drums.wav
> Why are you using OSS emulation? I find it rather quirky still in 0.9.0,
> what if you try with ALSA native? Also, you might want to use -z:db here
> too, not that I think it to be related to your problem but, oh well, you
> usually want the db system on when dealing with non-rt objects.

I tried it with -z:db with the same effect. I also used /dev/dsp with no

> > To mix:
> > ecasound -a:1 -i drums.wav -a:2 -i guitar1.wav -a:all -o /dev/dsp
> > And now the guitar is some odd fraction of a beat behind the drums. This
> > occurs both with ALSA and with OSS drivers. It occurs with every
> > reasonable buffer size. I have tried buffer sizes for mixing as well,
> > without apparent effect.
> How big is the delay actually? What if you mix down to file instead of the
> soundcard?
> If all else fails you could still go in interactive mode with a cs like
> this: ecasound -a:1 -i:drums.wav -a:2 guitar1.wav -a:all -o:/dev/dsp -c
> and fix the delay using aio-setpos.

I am running by default in interactive mode. That's why it doesn't show up in
the command.
The delay is fractions of a second. From my reading of aio-setpos that may be
too small an interval of time. Mixing to file produces the same effect. I
think it is happening pre-mix for reasons I'll explain in my response to

> Keep us informed of your success/failures,
> S. Massy

Thanks for your forebearence.

Roy Cutler
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