Re: [fluid-dev] Status of synth.audio-channels and synth.audio-groups

[Tom M.]

> Indeed that's the behaviour I expect. Do I have to specify 16? I tested
> with lower numebrs (e.g. 4, 6)... Maybe that is the problem?

Well, one midi port can always address 16 channels, and to avoid tinkering 
like "on which midi channel does instrument 5 has to play now so it will be 
heard on output 3" you better just use synth.audio-channels=16 ;)


Tom




Am Dienstag, 26. April 2016, 17:08:57 schrieb Lorenzo Sutton:
> Hi Tom,
> 
> On 26/04/2016 17:03, Tom M. wrote:
> > Hi Lorenzo,
> > 
> >> Thanks for the pointers. From what you write, therefore, it is not
> >> currently possible to route each midi channel to an independent audio
> >> output with jack. Right?
> > 
> > It is possible. Have you tried smth like:
> > 
> > fluidsynth -o audio.jack.multi=no -o synth.audio-channels=16 -o
> > synth.audio- groups=16  "someSoundfont.sf2"
> > 
> > you should get 16 stereo output channels. and since there 16 midi
> > channels,
> > each midi channel will get its own stereo channel. or which behaviour do
> > you experience?
> 
> Indeed that's the behaviour I expect. Do I have to specify 16? I tested
> with lower numebrs (e.g. 4, 6)... Maybe that is the problem?
> 
> > NOTE: actually audio.jack.multi should be set to "yes". however this
> > option
> > currently has inverse logic. thats a bug. leaving it at "no" should give
> > you multiple channels though.
> 
> Yes I read about this and was using the 'no' option.
> 
> > Another bug related to that: whenever specify N output channels while N>1
> > there wont be any effects applied, see this ticket
> > 
> > https://sourceforge.net/p/fluidsynth/tickets/137/
> > 
> > 
> > I've attached two patches that should fix/workaround those two issues.
> 
> Good to know. And thanks for the patches.
> 
> > Tom
> > 
> > Am Dienstag, 26. April 2016, 09:36:36 schrieb Lorenzo Sutton:
> >> Hi Jean-Jacques,
> >> 
> >> On 25/04/2016 14:02, jean-jacques.ceresa wrote:
> >>> Hi,
> >>> May be this will help.
> >>> This link is a starting point of discussion.
> >>> 
> >>> http://lists.nongnu.org/archive/html/fluid-dev/2015-04/msg00009.html
> >>> 
> >>> 1)It gives functionnal behaviour of synt.audio-channels settings.
> >>> 2)audio.jack.multi is discuted also (with a possible minor bug).
> >>> 
> >>> 3) audio-groups and audio-channels number are used at mixer
> >>> initialization time
> >>> to define the maximum output buffer number like this.
> >>> 
> >>>     output_buffer_count = max (audio-channels,audio-groups).
> >>> 
> >>> May be synth.audio-groups is only useful when one want for the plugin
> >>> effect unit ?.
> >> 
> >> Thanks for the pointers. From what you write, therefore, it is not
> >> currently possible to route each midi channel to an independent audio
> >> output with jack. Right?
> >> 
> >> The actual use cases I'm after are essentially 2:
> >> 1. Record different instruments from a "general midi" soundfont (on
> >> different midi channels) independently e.g. in Ardour on a track per
> >> instrument.
> >> 2. Record drums from a drum soundfont independently to their own track
> >> in the DAW (Ardour). In that case I woul be sequencing each drum on its
> >> own channel.
> >> 
> >> I understand use case 2 is rather corner, but 1. is probably not that
> >> exotic.
> >> 
> >> Lorenzo.
> >> 
> >>> jjc.
> >>> 
> >>> Le 24/04/2016 03:11, Lorenzo Sutton a écrit :
> >>>> Hi all,
> >>>> 
> >>>> 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.
> >>>> 
> >>>> Lorenzo
> >>>> 
> >>>> _______________________________________________
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> >>> 
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