Apply LADSPA filter to only one channel of multichannel output with Alsa and PulseAudio

Posted by justinzane on Ask Ubuntu See other posts from Ask Ubuntu or by justinzane
Published on 2012-09-29T04:07:42Z Indexed on 2012/09/29 9:49 UTC
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pulseaudio

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alsa

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filter

I want to apply a filter, specifically SWH's glame-bandpass-iir, to only one of several output channels. I want unfiltered output to go to the front, rear and LFE channels with bandpass filtered output for the center channel. I'm assuming that this needs to be done with Alsa's /etc/asound.conf but I cannot understand the documentation well enough to figure out how.

If there is a better way, via PulseAudio, Jack or whatever, I'm open to whatever works. Thanks.

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