Re: [ecasound] Using Gverb with pan

From: Kai Vehmanen <kvehmanen@email-addr-hidden>
Date: Fri Apr 28 2006 - 09:48:01 EEST


On Mon, 24 Apr 2006, Joel Roth wrote:

> Gverb docs (actually info from analyseplugin -- see below)
> seems to say that this effect converts one input to two
> outputs.
> ecasound -i one-channel.wav \
> -el:gverb,80,9,0.9,0.75,0,-6,-8 \
> -o alsa,stereo

the gverb output will be stereo, but with the above setup, the alsa device
might be opened in mono mode, so you'll only hear the first channel.
To work around this, open the the output in stereo mode and it should

ecasound -i onech.wav -el:gverb,... -f:16,2,44100 -o alsa,stereo

To debug this, run with -ddd and looks for "(audiofx_ladspa)
Instantiated...". It should print out how many input and output ports are
really used for the LADSPA plugin loaded.

> If I use a chain setup as below with channel copy and
> panning, I hear reverb on both channels with the signal
> panned fully left, and no output with the signal panned
> fully right. (Sample chainsetup below.)

Yes, this happens because gverb only takes mono input (what is on the
first/left channel, and overrides any audio on the second/right channel).
To to work around this, put the panning chainop after gverb.

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Received on Fri Apr 28 12:15:03 2006

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