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

[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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