Subject: Re: [ecasound] trouble panning with -epp
From: CLOTILDE (guy.clotilde_AT_wanadoo.fr)
Date: Thu Oct 25 2001 - 07:15:35 EEST
humpf... arg.... too bad I forgot to erase the epp and ea that I wanted to put after the name of the wave. Next time I'll be right =P.
CLO
On Tue, 23 Oct 2001 01:53:07 +0300 (EEST)
Kai Vehmanen <k_AT_eca.cx> wrote:
> On Mon, 22 Oct 2001, CLOTILDE Guy Daniel wrote:
>
> >> I've got 3 single channel tracks that I want to pan across the left to
> >> right sound field. I'm using the following ecs script:
> > ----cut-------
> > -f:16,1,44100
> > -a:1 -epp:0 -ea:500 -i:sax1.wav -ea:500 -erc:1,2 -epp:0
> > -a:2 -epp:50 -ea:500 -i:trumpet1.wav -ea:500 -erc:1,2 -epp:50
> > -a:3 -epp:100 -ea:500 -i:trombone1.wav -ea:500 -erc:1,2 -epp:100
> > -a:all -f:16,2,44100 -o:alsa,default
> > ----cut-------
>
> You have the right idea. The minimum setup to do panning of mono-files
> would be:
>
> --cut--
> -a:1 -i:sax1.wav -erc:1,2 -epp:0
> -a:2 -i:trumpet1.wav -erc:1,2 -epp:50
> -a:3 -i:trombone1.wav -erc:1,2 -epp:100
> -a:all -f:16,2,44100 -o:alsa,default
> --cut--
>
> The actual signal chain is something like ('---' = mono channel)
>
> sax1.wav |--'1'---- erc ----| epp |---\
> \-----| |---\\
> \\
> trumpet1.wav |--'2'---- erc ----| epp |------- | alsa,default
> \-----| |------- |
> //
> trombone1.wav |--'3'---- erc ----| epp |---//
> \-----| |---/
>
> The critical points are:
>
> - ecasound automatically notices that the three
> input files are mono files
> - chains contain mono signal until -erc operator,
> which transforms the chain into a stereo chain
> - now -epp works as excepted
> - chains are mixed to the alsa device channel-wise
>
> If you leave out the -erc effect, chains will still be converted to
> stereo, but on each chain, only the first channel (left) will contain any
> audio from the input files.
>
> --
> http://www.eca.cx
> Audio software for Linux!
>
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