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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