From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: problems with the mixer
Date: Wed, 19 May 2004 12:26:42 +0200
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To: Aner Gusic <aner@lysator.liu.se>
Cc: alsa-devel@lists.sourceforge.net
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At Wed, 19 May 2004 00:13:58 +0200,
Aner Gusic wrote:
>=20
> * Takashi Iwai <tiwai@suse.de>:
>=20
> > doesn't it work like below?
> >=20
> > 	% aplay -Dfront some-2ch.wav
> > 	% aplay -Drear some-2ch.wav
>=20
> You missunderstood me, I want to use one player to play regular mp3's
> and be able to hear it on both front and rear speakers.  Even if I
> could sync that thing above it would be a very ugly solution to my
> problem.=20
>=20
> S=E5, "aplay some-2ch.wav" works fine, except for the fact that rear
> volume is initialized to 0.  I can get some other routing channels
> with a swich so rear volume isn't used, but then rear and front volume
> aren't independent (se my first mail for details)  :/ .

ok, then you need something similar like below:

pcm.dup4ch {
	type hooks
	slave.pcm {
		type hw
		card 0
		device 0
	}
	hooks.0 {
		type ctl_elems
		hook_args [
			{
				name "Rear Path"
				preserve true
				value true
			}
			{
				name "PCM Reverb Playback Volume"
				index { @func private_pcm_subdevice }
				preserve true
				value 127
			}
		]
	}
}=09


then run "aplay -Ddup4ch some-2ch.wav"


Takashi


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