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

[Tom M.]

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?

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.

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.


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
> >> 
> >> _______________________________________________
> >> fluid-dev mailing list
> >> address@hidden
> >> https://lists.nongnu.org/mailman/listinfo/fluid-dev
> > 
> > _______________________________________________
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> 
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