Willy WOLFF | 14 Sep 18:45 2011
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newbee want mixing a 3 channel wav file

Hi,

I would like to mixing a 3 channel wav file with :
- first track of wave file 90% left panning
- second --------------- 50-50 pan
- third 90% right panning and amplifing 300%
and finaly output to one stereo wav file.

This is my command, but doesn't wath i want :

ecasound -a:1,2,3 -f:,3 -i tm-2011-09-12T22\:10\:46.wav \
    -a:1 -epp:10 \
    -a:2 -epp:50 \
    -a:3 -epp:90 -ea:300 \
    -a:all -f:,2 -o final.wav

On right channel, i have second and third track amplified. I only want
third track amplified. Wath's wrong?

Thanks.

ps: i am french man, i know my english is saddly poor ...

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Joel Roth | 14 Sep 20:21 2011
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Re: newbee want mixing a 3 channel wav file

On Wed, Sep 14, 2011 at 06:45:48PM +0200, Willy WOLFF wrote:
> Hi,
> 
> I would like to mixing a 3 channel wav file with :
> - first track of wave file 90% left panning
> - second --------------- 50-50 pan
> - third 90% right panning and amplifing 300%
> and finaly output to one stereo wav file.
> 
> This is my command, but doesn't wath i want :
> 
> ecasound -a:1,2,3 -f:,3 -i tm-2011-09-12T22\:10\:46.wav \
>     -a:1 -epp:10 \
>     -a:2 -epp:50 \
>     -a:3 -epp:90 -ea:300 \
>     -a:all -f:,2 -o final.wav

> On right channel, i have second and third track amplified. I only want
> third track amplified. Wath's wrong?

Hi WW,

With your current Ecasound setup, each chain a:1, a:2, a:3
is getting the entire signal, i.e. all three channels.

-epp operates on the first two channels, so 
you need to copy each individual signal to stereo.

Here is what I believe you need to do (not tested.)

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Willy WOLFF | 14 Sep 22:15 2011
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Re: newbee want mixing a 3 channel wav file

On 09/14/2011 08:21 PM, Joel Roth wrote:
> ecasound -a:1,2,3 -f:,3 -i tm-2011-09-12T22\:10\:46.wav \
>     -a:1 -chcopy:1,2 -epp:10 \
>     -a:2 -chcopy:2,1 -epp:50 \
>     -a:3 -chcopy:3,1 -chcopy:3,2 -epp:90 -ea:300 \
>     -a:all -f:,2 -o final.wav

Yeah :)
Thanks a lot.

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S. Massy | 15 Sep 16:34 2011
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Re: newbee want mixing a 3 channel wav file

On Wed, Sep 14, 2011 at 06:45:48PM +0200, Willy WOLFF wrote:
> Hi,
> 
> I would like to mixing a 3 channel wav file with :
> - first track of wave file 90% left panning
> - second --------------- 50-50 pan
> - third 90% right panning and amplifing 300%
> and finaly output to one stereo wav file.
> 
> This is my command, but doesn't wath i want :
> 
> ecasound -a:1,2,3 -f:,3 -i tm-2011-09-12T22\:10\:46.wav \
>     -a:1 -epp:10 \
>     -a:2 -epp:50 \
>     -a:3 -epp:90 -ea:300 \
>     -a:all -f:,2 -o final.wav
The problem here is that all chains take your 3 channels as input, so
you have to do some channel manipulation for it to work properly. Try
something like this (untested):
! ecasound -a:1,2,3 -f:,3 -i tm-2011-09-12T22\:10\:46.wav \
	-a:1 -chorder:1,0,0 -epp:10 \
	-a:2 -chorder:2,0,0 -epp:50 \
	-a:3 -chorder:3,0,0 -epp:50 -ea:300 \
	-a:all -f:,2 -o final.wav

You get the idea.

HTH,
S.M.

(Continue reading)

S. Massy | 16 Sep 18:12 2011
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Sidechaining a compressor with ecasound?

Hello,

I'd like to sidechain a compressor using ecasound, but I'm not sure
which road to take. 

One question that arises is that of whether ecasound supports ladspa
plugins with more than two inputs, like sc3. Would writing a third
channel of audio automatically route that channel to the third input?

another possibility I see is sticking a stereo compressor like sc4 in a
chain with loops at either end and do channel manipulation to send the
audio to be processed to the left channel and the controlling audio to
the right channel. Could that possibly work?

Cheers,
S.M.

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Kai Vehmanen | 16 Sep 21:44 2011

Re: Sidechaining a compressor with ecasound?

Hi,

On Fri, 16 Sep 2011, S. Massy wrote:

> One question that arises is that of whether ecasound supports ladspa
> plugins with more than two inputs, like sc3. Would writing a third
> channel of audio automatically route that channel to the third input?

yup, this works. Just make sure you feed matching number of channels (e.g. 
a stereo stream to a LADSPA plugin with two inputs) and ecasound will 
detect this and instantiate only one plugin and route the channels to the 
different inputs in the order the inputs are discovered.

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rob | 19 Sep 12:29 2011

inverse gate

 hello,
 am trying to process some audio with an inverse gate effect.
 that is, a filter which only allows the audio below a certain theshold 
 to pass (perhaps this has another name).

 i thought that maybe i could just use a regular gate such as 
 -enm:0.8,10,150,150,20
 then bounce the result down to a file - then mix that file with a phase 
 inverted version of the original to cancel out the common samples
 this did not work for me (to invert the phase i muliplied the gain by 
 -1 in  sox)
 there must be an easier approach?
 is there some negative value i can give to the normal gate filter to 
 make it work the other way around?
 any ideas?
 thanks

 rob

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S. Massy | 19 Sep 17:32 2011
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Re: Sidechaining a compressor with ecasound?

On Fri, Sep 16, 2011 at 10:44:27PM +0300, Kai Vehmanen wrote:
> Hi,
> 
> On Fri, 16 Sep 2011, S. Massy wrote:
> 
> >One question that arises is that of whether ecasound supports ladspa
> >plugins with more than two inputs, like sc3. Would writing a third
> >channel of audio automatically route that channel to the third input?
> 
> yup, this works. Just make sure you feed matching number of channels
> (e.g. a stereo stream to a LADSPA plugin with two inputs) and
> ecasound will detect this and instantiate only one plugin and route
> the channels to the different inputs in the order the inputs are
> discovered.
Great! But how would this be achieved? Here is what I tried:
ecasound -c -a:all -f:s24,2,48000 -a:1 -i raw/Vocals.wav \
	 -a:2 -i selfproc/lead3.wav \
	 -a:3 -i:loop,SCin -o:loop,SCout -eli:1427,0,75,100,-20,10 \
	 -a:1 -o:loop,SCin -a:2 -o:loop,SCin -chcopy:2 \
	 -a:4 -i:loop,SCout -epp:50 -o:jack,system

But ecasound claims it is unable to create a valid chainsetup from this.
It seems right to me. What am I missing?

Cheers,
S.M.

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S. Massy | 19 Sep 17:48 2011
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Re: Sidechaining a compressor with ecasound?

Should read -chcopy:1,2

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Julien Claassen | 19 Sep 17:54 2011
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Re: Sidechaining a compressor with ecasound?

Hi Massy!
   If you do that, you must have a chain with three input channels. so you 
must be deavious and use the channel copying to your advantage. I suppose you 
must start out with mono or stereo chains and then temporarily go into a chain 
with 3 channels. Still it's bloody aweful, since sc3 has three inputs, but two 
outputs. I'm not sure what Ecasound will say to that. It looks rather 
difficult to map two outputs of sc3 to three outputs of the chain.
   this is not much help, I agree, but perhaps it can lead youa little way on 
your chosen path.
   Warm regards
             Julien

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