Eric, thanks so much for your attention to this. Good catch on the type of quote! I changed them to single quotes and also took out the '\' separaters because greater-thans (>) crept in. And... sound happened! But we're not quite there on collecting the separate streams. The ALSA plug listed for output (pcm.testout4) contains 4 channels but I only get sound on two of them and it seems to be the whole signal. I must let this rest until tonight, but wanted to a) report the progress and, b) show you the screen log. Hopefully we're close. Once a 2-way crossover works, then I want to expand to a 3-way. ...eventually... Cheers! Frank terminal log: root@beaglebone:/# export LADSPA_PATH=$LADSPA_PATH:/usr/local/lib/ladspa:/usr/lib/ladspa root@beaglebone:/# chrt -f 45 sox -V3 -M '| sox -t alsa dsnoop:1,0 -p remix 1v1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0' '| sox -t alsa dsnoop:1,0 -p remix 1v1 ladspa ACDf 22 1 0 240 0.707 0 0 ladspa ACDf 22 1 0 240 0.707 0 0' '| sox -t alsa dsnoop:1,0 -p remix 2v1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0' '| sox -t alsa dsnoop:1,0 -p remix 2v1 ladspa ACDf 22 1 0 240 0.707 0 0 ladspa ACDf 22 1 0 240 0.707 0 0' -t alsa plug:testout4 remix -m 1,2 3,4 sox: SoX v14.4.1 Input File : 'dsnoop:1,0' (alsa) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:00.09 [00:00:00.00] Out:0 [ | ] Clip:1 sox INFO formats: detected file format type `sox' Input File : 'dsnoop:1,0' (alsa) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:00.09 [00:00:00.00] Out:0 [ | ] Clip:0 sox INFO formats: detected file format type `sox' Input File : 'dsnoop:1,0' (alsa) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:00.09 [00:00:00.00] Out:0 [ | ] Clip:0 sox INFO formats: detected file format type `sox' Input File : 'dsnoop:1,0' (alsa) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:00.09 [00:00:00.00] Out:0 [ | ] Clip:0 sox INFO formats: detected file format type `sox' Input File : '| sox -t alsa dsnoop:1,0 -p remix 1v1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0' (sox) Channels : 1 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no Comment : 'Processed by SoX' Input File : '| sox -t alsa dsnoop:1,0 -p remix 1v1 ladspa ACDf 22 1 0 240 0.707 0 0 ladspa ACDf 22 1 0 240 0.707 0 0' (sox) Channels : 1 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no Comment : 'Processed by SoX' Input File : '| sox -t alsa dsnoop:1,0 -p remix 2v1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0' (sox) Channels : 1 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no Comment : 'Processed by SoX' Input File : '| sox -t alsa dsnoop:1,0 -p remix 2v1 ladspa ACDf 22 1 0 240 0.707 0 0 ladspa ACDf 22 1 0 240 0.707 0 0' (sox) Channels : 1 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no Comment : 'Processed by SoX' Output File : 'plug:testout4' (alsa) Channels : 2 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no sox INFO sox: effects chain: input 48000Hz 4 channels sox INFO sox: effects chain: remix 48000Hz 2 channels sox INFO sox: effects chain: output 48000Hz 2 channels In:0.00% 00:00:00.26 [00:00:00.00] Out:10.2k [-=====|=====-] Hd:0.0 Clip:2 sox WARN alsa: under-run In:0.00% 00:00:00.60 [00:00:00.00] Out:28.7k [======|======] Hd:0.0 Clip:1 sox WARN alsa: over-run In:0.00% 00:03:23.78 [00:00:00.00] Out:9.78M [ =====|===== ] Hd:4.0 Clip:52 [system ran happily from here - then ^C issued] sox WARN ladspa: ladspa clipped 11 samples; decrease volume? sox WARN ladspa: ladspa clipped 41 samples; decrease volume? Aborted. In:0.00% 00:03:23.78 [00:00:00.00] Out:9.78M [ =====|===== ] Hd:0.0 Clip:60 sox WARN ladspa: ladspa clipped 12 samples; decrease volume? sox WARN ladspa: ladspa clipped 48 samples; decrease volume? Aborted. In:0.00% 00:03:23.61 [00:00:00.00] Out:9.77M [ | ] Hd:3.7 Clip:0 Aborted. In:0.00% 00:03:23.52 [00:00:00.00] Out:9.77M [ -====|==== ] Hd:0.3 Clip:878 sox WARN remix: remix clipped 878 samples; decrease volume? Aborted. In:0.00% 00:03:23.86 [00:00:00.00] Out:9.79M [ | ] Hd:3.8 Clip:0 Aborted. root@beaglebone:/# -- View this message in context: http://sox.10957.n7.nabble.com/implementing-loudspeaker-crossovers-using-Sox-LADSPA-plugins-tp5464p5720.html Sent from the SoX mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. 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