[jOrgan-user] Convolution

[Aaron Laws]

I was hoping to find something simple in Audacity, but was unable. I
remember having this functionality very easily at hand in Cool Edit Pro
2.1, but that was back when I used Microsoft Windows.

How are you all applying impulse response convolution reverberation to
recordings?

I can record my organ very simply by virtually plugging the output to the
input and playing the organ. After making such a recording (without
fluidsynth reverb), I would imagine running something like

convolve impulseresponse.wav recording.wav -o reverb-recording.wav;

Like I said, I haven't found anything like this. Any help is appreciated.
Thank you.

In Christ,
Aaron Laws

[David Gritter]

On linux machines typically the sound generator output is directed
through jackaudio to a reverberator (jconvolver), as well as to audio
output for speakers. Jconvolver output can be used directly for audio
output, can be sent to speakers at the back of the room, or can be mixed
into other audio channels with direct organ sounds. In any case, you
can configure audacity for jackaudio input and connect whatever clean
or convolution reverberator signals you want and simply record the
result into audacity.

Post by Aaron Laws
I was hoping to find something simple in Audacity, but was unable. I
remember having this functionality very easily at hand in Cool Edit
Pro 2.1, but that was back when I used Microsoft Windows.
How are you all applying impulse response convolution reverberation to
recordings?
I can record my organ very simply by virtually plugging the output to
the input and playing the organ. After making such a recording
(without fluidsynth reverb), I would imagine running something like
convolve impulseresponse.wav recording.wav -o reverb-recording.wav;
Like I said, I haven't found anything like this. Any help is
appreciated. Thank you.
In Christ,
Aaron Laws
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[Aaron Laws]

Post by David Gritter
On linux machines typically the sound generator output is directed
through jackaudio to a reverberator (jconvolver), as well as to audio
output for speakers. Jconvolver output can be used directly for audio
output, can be sent to speakers at the back of the room, or can be mixed
into other audio channels with direct organ sounds. In any case, you can
configure audacity for jackaudio input and connect whatever clean or
convolution reverberator signals you want and simply record the result into
audacity.

Thank you, that's very helpful. I use pulse audio and I'm not keen on
setting up jack in addition, so what I did is record the dry sound with
audacity, save, then "post-process" using fconvolver. fconvolver is the
offline, file-based convolution engine corresponding to jconvolver. Since
fconvolver runs offline, it takes much less time than the length of the
recording to convolve the whole thing. I've found that a roughly seven
minute recording takes less than .5 seconds or so to convolve with any of
my impulse responses. This means that a different impulse response on the
same recording can be computed in roughly no time.

Thanks again for the tip.

In Christ,
Aaron Laws