On Sun, Apr 24, 2016 at 03:13:42AM +0200, Lorenzo Sutton wrote: > Hi all, > > I have also posted this on the fluid-dev list, but maybe there is some > wisdom on LAU about it as well :) > > What is the current status of synth.audio-channels and > synth.audio-groups on Linux with jack? > > By starting fluidsynth with something like: > > fluidsynth -a jack -o synth.audio-channels=4 -o synth.audio-groups=4 \ > -o audio.jack.multi=no > > I do get 4 pairs of jack audio outputs. > > However the behaviour isn't as expected at least according to this (very > old post): > > https://lists.nongnu.org/archive/html/fluid-dev/2004-02/msg00027.html > > Ideally is there a way to have each channel routed to a separate audio > output on jack these days? Any help appreciated. '-o synth.audio-groups=4' fails: `fluid_settings_getint' returns 1 after `process_o_cmd_line_option' (also tested with a printf). sh> fluidsynth -a jack -o synth.audio-groups=4 <<< settings 2>/dev/null \ | grep audio-groups synth.audio-groups 1 Idem with "-o synth.audio-channels=4 -o synth.audio-groups=4", but "-G 4" works: sh> fluidsynth -a jack -G 4 <<< settings 2>/dev/null | grep audio-groups synth.audio-groups 4 There is a comment in `src/fluidsynth.c:594': /* The 'groups' setting is only relevant for LADSPA operation * If not given, set number groups to number of audio channels, because * they are the same (there is nothing between synth output and 'sound card') */ tested with: sh> fluidsynth -a jack -L 4 <<< settings 2>/dev/null | grep audio-groups synth.audio-groups 4 The follow example works (audio.jack.multi=no by default): sh> fluidsynth -a jack -L 4 load /usr/share/sounds/sf2/FluidR3_GM.sf2 select 0 1 0 0 select 1 1 0 20 select 2 1 0 30 select 3 1 0 40 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
