[ecasound] Using Gverb with pan

From: Joel Roth <joelz@email-addr-hidden>
Date: Mon Apr 24 2006 - 09:01:34 EEST

Hi Ecasounders,

Gverb docs (actually info from analyseplugin -- see below)
seems to say that this effect converts one input to two

If I apply gverb naively to a one-channel input, I hear
one channel output.

ecasound -i one-channel.wav \
         -el:gverb,80,9,0.9,0.75,0,-6,-8 \
                 -o alsa,stereo

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.)

This sounds suspiciously like the symptom I read about in
the user's manual:

        5.5.3 Problems with panning mono files

Does that mean gverb outputs only a mono signal, and
therefore that I need to apply it to a mono section
of my chainsetup?

Is it possible to write a preset applying one effect
to each channel?

Is there some way to get the full two-channel goodness
of the gverb output under ecasound?


# ecasound chainsetup file
# general
-B:rtlowlatency -n:/home/jroth/ecmd/atsuko-d/session.ecs -X -z:noxruns -z:nopsr -z:mixmode,sum -t:606.238

# audio inputs
-a:5 -f:s16_le,1,44100 -i:/media/sessions/atsuko-d/leslie-t_4.wav,

# audio outputs
-a:5 -f:s32_le,10,44100 -o:alsa,ice1712

# chain operators and controllers
-a:5 -erc:1.00,2.00 -ea:133.00 -epp:50.00 -eli:1216,75.75,7.50,0.50,0.75,-70.00,0.00,-17.50

For reference, here is the Gverb parameter information.

Plugin Name: "GVerb"
Plugin Label: "gverb"
Ports: "Roomsize (m)" input, control, 1 to 300, default 75.75
        "Reverb time (s)" input, control, 0.1 to 30, default 7.575
        "Damping" input, control, 0 to 1, default 0.5
        "Input bandwidth" input, control, 0 to 1, default 0.75
        "Dry signal level (dB)" input, control, -70 to 0, default -70
        "Early reflection level (dB)" input, control, -70 to 0, default 0
        "Tail level (dB)" input, control, -70 to 0, default -17.5
        "Input" input, audio
        "Left output" output, audio
        "Right output" output, audio

Joel Roth
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Received on Mon Apr 24 16:15:01 2006

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