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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