On Mon, 20 Nov 2006 00:15:23 +0100
"J. Pauli" <jpauli@xxxxxxx> wrote:
> Hi Frédéric,
>
> I tried exactly the same some time ago. Unfortunately the outcome was
> the same: no sound on both amps. My guess was, that the front and rear
> "output thingy" mute each other when they got initialized, that is one
> could use either of them but not both. I don't know for sure but the
> only option I see is to combine the streams and then route it through
> the surround51 device but I never came that far.
>
> Cheers, Jan
>
> ---
>
> BISSON Frédéric wrote:
> > Hi there !
> >
> > I'm trying to do biamplification (maybe triamplification) under Linux
> > (FC6 x86_64) with ALSA and an Audigy 1 ES.
> >
> > I tried the following configuration :
> >
> > -- Low-pass filter --- rear speakers --->
> > /
> > ->-multi plugin
> > \
> > -- High-pass filter -- front speakers --->
> >
> > (the asoundrc is at the end of this mail)
> >
> > I use aplay -Dbiamp test.wav to run a test
> > I get no error message but my speakers emit no sound.
> > aplay -v -v -Dbiamp test.wav does not give more help.
> >
> > After investigation, it seems that the problem is between the multi
> > plugin and the ladspa plugins but I have not been able to determine what
> > was wrong. I have also tested each part individually and they seem to
> > work. It is not due to a mixer settings as every output is set to max,
> > neither it is due to a jack incorrectly plugged behind the soundcard.
> >
> > Does anyone have tried to do something similar ?
> > Does anyone see what I did wrong ?
> >
> > Thanks
> >
> > Frédéric Bisson
> >
> > ------ ~/.asoundrc -------------------------------------------------
> > # generate a 4 channels stream from a 2 channels stream (stereo)
> > pcm.biamp {
> > type plug
> > slave.pcm "bassmediumhigh"
> > route_policy "duplicate"
> > }
> >
> > # create a fork with 2x2 channels stream from one 4 channels stream,
> > # one stream for bass frequencies and
> > # one stream for medium-high frequencies
> > pcm.bassmediumhigh {
> > type multi
> >
> > slaves {
> > a {
> > pcm "copybass"
> > channels 2
> > }
> >
> > b {
> > pcm "copymediumhigh"
> > channels 2
> > }
> > }
> >
> > bindings [
> > { slave a channel 0 }
> > { slave a channel 1 }
> > { slave b channel 0 }
> > { slave b channel 1 }
> > ]
> > }
> >
> > # convert bass stream from multi to accomodate ladspa lpf
> > pcm.copybass {
> > type plug
> > slave.pcm "bass"
> > slave.format FLOAT_LE
> > slave.rate 44100
> > slave.channels 2
> > }
> >
> > # convert medium-high stream from multi to accomodate ladspa hpf
> > pcm.copymediumhigh {
> > type plug
> > slave.pcm "mediumhigh"
> > slave.format FLOAT_LE
> > slave.rate 44100
> > slave.channels 2
> > }
> >
> > # apply low-pass filter at 200 Hz
> > pcm.bass {
> > type ladspa
> > slave.pcm "copyfront"
> > path "/usr/lib64/ladspa"
> > plugins [ {
> > label lpf
> > input {
> > controls [ 200 ]
> > }
> > } ]
> > }
> >
> > # apply high-pass filter at 200 Hz
> > pcm.mediumhigh {
> > type ladspa
> > slave.pcm "copyrear"
> > path "/usr/lib64/ladspa"
> > plugins [ {
> > label hpf
> > input {
> > controls [ 200 ]
> > }
> > } ]
> > }
> >
> > # send bass stream to front speakers
> > # front is system defined
> > pcm.copyfront {
> > type plug
> > slave.pcm "front"
> > }
> >
> > # send medium-high stream to rear speakers
> > # rear is system defined
> > pcm.copyrear {
> > type plug
> > slave.pcm "rear"
> > }
>
>
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Just curious - does LPF alone or HPF alone work ?
Anyway, if you don't insist on .asoundrc implementation,
you can use any jackd-capable LADSPA host and JACK.
A well known jackd-capable LADSPA host is 'ecasound'.
It's a much more sure way for those of us who do not master
.asoundrc trickery - I belong to the category.
--Sergei.
--
Visit my http://appsfromscratch.berlios.de/ open source project.
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