Hi Frédéric,
I tried exactly the same some time ago. Unfortunately the outcome wasthe 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 onecould use either of them but not both. I don't know for sure but theonly option I see is to combine the streams and then route it throughthe surround51 device but I never came that far.
Cheers, Jan
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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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