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Re: [fluid-dev] synth.audio-groups and LADSPA effects

From: Bill Peterson
Subject: Re: [fluid-dev] synth.audio-groups and LADSPA effects
Date: Tue, 4 Aug 2020 14:43:44 -0500

Thanks for the clarifications, all! I thought the main issue was probably an ALSA limitation, but I think I can do what I want using JACK and the information you've given me.

On Tue, Aug 4, 2020 at 2:33 AM Marcus Weseloh <marcus@weseloh.cc> wrote:

Am Di., 4. Aug. 2020 um 02:16 Uhr schrieb Ceresa Jean-Jacques
> 1)The number of rendered audio output (nbr_outputs) is dependant of synth.audio-channels and synth.audio-group:
> nbr_outputs = max(synth.audio-channels, synth.audio-groups) (default is 1).
> These audio outputs will be played by the sound card (if it is capable to play this nbr_outputs amount of course).

Please note that this is highly dependent on the audio driver used.
AFAIK, only the jack driver supports multi-channel audio output. All
other drivers (including alsa) can only output a single stereo signal.

> [...]
> 4) Which output, internal effects (reverb, chorus) are mapped on ?
> As Marcus already said, both internal reverb and chorus are mapped only to output 0 (because "synth.effects-groups" has a default value of 1).
> However, if "synth.effects-groups" is set to 2,  two distinct internal instances pair (reverb + chorus) should be available on each distinct audio output (0 et 1).

This also only applies only to the jack driver. Again AFAIK, for all
other drivers (including alsa), the reverb and chorus signals are
always rendered to the first (and only) stereo output, regardless of
the setting of synth.effects-channels.


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