Re: [fluid-dev] Re : no effects applied using multiple stereo channels

[Tom M.]

ok, thanks.

I executed

fluidsynth -a jack -o synth.audio-channels=3 mysoundfont.sf2

and applied my reverb settings. Since my soundcard doesn't have 3
outputs, I mapped them all to one. I actually planned to record it
with ardour later... However, I don't get any reverb at all.

Setting synth.audio-channels to 1 and applying the same reverb
settings and everything works fine.


Apart from that, why is there actually a need for mapping all the
reverb to output 0? Wouldn't it be more useful to map them to their
corresponding output? Meaning, according to you example:

Dry sound + reverb from MIDI Channel 1 to output 1,
Dry sound + reverb from MIDI Channel 2 to output 2,
Dry sound + reverb from MIDI Channel 3 to output 0, etc.


Tom


2015-04-07 20:28 GMT+02:00 CERESA Jean-Jacques ENAC/ENAC
<address@hidden>:
> Hi
> 1) If you want to use more than 1 stereo channel output
> you need to set  "audio-channels" settings to the number of output you want.
> For example, to use 3 outputs (assuming your audio card has 3 outputs!)
> set audio-channels to 3.
> 2) With this settings FluidSynth mixer dispatchs voices to the 3 outputs
> depending on MIDI channel. Like this:
> MIDI Channels 0,3,6,9, 12,15.. to output 0.
> MIDI Channels 1,4,7,10,13,16.. to output 1.
> MIDI Channels 2,5,8,11,14,17.. to output 2.
> 3) But, no matter the number of outputs you need, the output of effects
> units (reverb & chorus) go to audio output 0 only !.
> So in the above example, if you apply reverb to Instrument on MIDI channels
> 0,1 and 2 the result is:
> - Dry sound from MIDI Channel 0 go to output 0, and reverb sound go to
> output 0.
> - Dry sound from MIDI Channel 1 go to output 1, but reverb sound go to
> output 0 (not 1!).
> - Dry sound from MIDI Channel 2 go to output 2, but reverb sound go to
> output 0.(not 2!).
> jjc
>
>
> Le 07/04/15, "Tom M." <address@hidden> a écrit :
>
> hi,
>
> i'm trying to get reverb effect applied separately for each midi
> channel. however, no matter what i try, if my output has more than 1
> stereo channel, no reverb effect is applied. is this
> supposed to work somehow?
>
> in my case the reverb effect is enabled / controlled via MIDI CC 91.
>
>
> using FluidSynth 1.1.6 under openSUSE.
>
>
> Tom
>
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