23 Feb
2010
23 Feb
'10
2:22 p.m.
On Tue, Feb 23, 2010 at 04:37:53PM +0300, alex stone wrote:
Jorn, Fons, i'm looking for a ladspa UHJ encoder,
and can't seem to
find one. Any idea if such a beast exists? Or if there's a standalone
instance or ambdec preset i can use, and route in and out of?
Jconvolver can do this, there's a config file
in the distribution.
Some general questions.
When i use Jconvolver standalone (my preference) and test with a
*amb.conf, i get 1 input and 4 outputs WXYZ. Is this correct for 4
signals coming into 1, into the *amb.conf, or do i need to change this
to reflect individual WXYZ routing, from something like a MASTER
strip, or from an ambdec plugin in a channel strip? (i'm trying to get
the signal chain sorted out correctly.) i.e. 4 in, 4 out.
I'm using all mono ins for sound sources, and want
to reflect
positioning in the busses, as i have multitrack 1st violins,
2ndviolins, etc...
So my 1st violins (4 monotracks) are going into a 1stviolin buss (4
ins) and in the buss signal chain, i'm adding a ladspa amb mono
panner, which naturally gives me 4 outs, then the chain continues to
the MASTER and jconvolver, back into a jconv buss in the mixer with
the intent of finally routing that to the UHJ buss...
This is not the recommended way to use such a reverb.
The outputs from jconvolver should just go into the
AMB mix bus. If you use Ardour you can connect them
directly to the master bus, or you could use a 'bus'
strip to have a gain control at that point.
The input of jconvolver should normally come from
post-fader aux sends on the same strips as where
you insert the AMB panners - the panner and the
aux send get the same post-fader signal.
This way you can set the level of reverb for each
panned source separately. The relative level of
the reverb is also preserved when you use either
the channel or master faders, as the reverb sits
in between those, as a side chain of the master
bus.
In fact you can do this becaus a convolution
reverb is a linear process: reverb (a) + reverb (b)
= reverb (a + b).
To be used like this the reverb must *not* include
the direct sound.
Ideally the input to the panner should also have
a variable delay - to put a source at a larger
distance you would then increase the send to the
reverb and increase the delay in the direct sound
via the panner. But this is a refinement that is
difficult to arrange in Ardour, it requires using
two strips for each panned source.
If the reverb has many inputs corresponding to
different source positions you would have as
many aux busses, plus one extra for the 'tail'
of the reverb which is usually a separate input
for jconvolver.
Ciao,
--
FA
O tu, che porte, correndo si ?
E guerra e morte !