Audacity Forum

almost identical to the clean track

I guess that in paid pro sound solutions there is a way to even isolate a particular voice or instrument according to a clean sample.

Do you know of one?

if I was a pro and or have 340 euros to spend on a software for regular use.

I think I have a noise removal tool plugin with audacity with sample but if I remember it doesn't work or is disapointing.
Do you know such a plugin that is satisfying enough ?

But what about the idea of a curve of intensity for effects plugins

French wrote:I guess that in paid pro sound solutions there is a way to even isolate a particular voice or instrument according to a clean sample.

French wrote:The problem with vocal remover is that you can't select a particular point of panning to be isolated or removed.(I guess It's not technically possible tough.)

French wrote:Hello,

I have several musical tracks, one clean and complete and the others are fragments of the clean track mixed with sound effects like (wind, water...)

Is there a way that audacity can automatically align the fragments with the clean track?

Is there something like booleans operations (AND , OR , XOR , NOT...) for audio because I want to keep the audio that is almost identical to the clean track from the fragmented tracks. So it would be the operator AND here in this case and Subtract would be NOT.[/quote[

It depends on how you define those operations.
as Boolean indicates, the operators work with False and true.
For numerical values, they are just compared bit-by-bit.
6 or 5 = 7 (1"2"4)
6 xor 5 = 3 (1+2)
6 and 5 = 4
etc
It is easier to apply those operations on images, due to the layered structure.
Audio is much more compact. A single sample can mean anything. It holds instant frequency, phase and amplitude.
extreme example:
One track could be a cosine wave at nyquist frequency: 1 -1 1 -1 1 -1...
The same tone as sine wave is: 0 0 0 0 0...
No chance to align.
However, it's not audible anyways (at e.g. 44.1 kHz)
There's are some code snippets on the forum for e.g. pattern search.
I've also written a plug-in to evaluate the actual latency for an original and a overdubbed recording. It tells you the relative shift of two similar tracks.
However, I've not spent too much time on this lately.

French wrote:When I want to clean a musical track from unwanted noises I used to use vocal remover plugins then equalization. It works when the noises or either
the music are center panned. The problem with vocal remover is that you can't select a particular point of panning to be isolated or removed.(I guess It's not technically possible tough.) And the problem with equalization is that you don't have a curve of intensity (0-100%) of the effect according to time(selection) in order to make the effect seamless in the whole track.

I was wondering the possibilities of a free program like audacity toward the paid counterparts. I hope my post is understandable.

Best regards.

steve wrote:
Example 1:

Example 2:

<span>When working with sounds that are not identical at the sample level, then the task becomes very much more difficult. However there is an FFT based plugin called "Stereo Tool Kit": <a href="http://forum.audacityteam.org/viewtopic ... </a></span>
Installation instructions are the same as for other Nyquist plugins (see previous link).
Note that this is an experimental plugin from Robert J H. Notes about how to use it are in that topic - if you need further information about that plugin, please post to that topic.

Robert J. H. wrote: Steve has mentioned my 2D Stereo Toolkit.
It has an additional rotation parameter when applying center removal or isolation.
For example, if the voice is halfways between center and right speaker, you'd enter -22.5 (degrees) to bring it into the middle before extracting.

Regarding intensity:
I assume that you mean some kind of envelope that acts on the effect itself, or am I mistaken?
Supposedly you wanted to remove the center only in specific passages, then its straightforward with the 2DST:

- Duplicate the original
- apply "Center Isolation (inverted).

Played together, the center will be gone.
You could now use the envelope tool to change the amount of the effect (or gain sliders for the whole track):
- on the second track, the center comes back when you drag the envelope down.
- on the first track, the side channels are attenuated, you'll prominently hear e.g. vocals, bass and drums (like soloing the second track).
There's a sample file in the topic that shows just this.


numerous effects can be treated like this--duplicate the track, apply the effect and invert it if necessary (reverb would work without that).

Some effects produce a delay though--you'll get a comb effect when playing the tracks together.

Effect parameter = (stereo field) rotation   range [-180;180] 

French wrote:Hello. I am sorry I was away and was unable to reply and sorry to bump this.

steve wrote:
Example 1:

Example 2:

<span>When working with sounds that are not identical at the sample level, then the task becomes very much more difficult. However there is an FFT based plugin called "Stereo Tool Kit": <a href="http://forum.audacityteam.org/viewtopic ... </a></span>
Installation instructions are the same as for other Nyquist plugins (see previous link).
Note that this is an experimental plugin from Robert J H. Notes about how to use it are in that topic - if you need further information about that plugin, please post to that topic.

Good plugin, so it seems the panning can be rotated and then the new center can be removed?

Robert J. H. wrote: Steve has mentioned my 2D Stereo Toolkit.
It has an additional rotation parameter when applying center removal or isolation.
For example, if the voice is halfways between center and right speaker, you'd enter -22.5 (degrees) to bring it into the middle before extracting.

Regarding intensity:
I assume that you mean some kind of envelope that acts on the effect itself, or am I mistaken?
Supposedly you wanted to remove the center only in specific passages, then its straightforward with the 2DST:

- Duplicate the original
- apply "Center Isolation (inverted).

Played together, the center will be gone.
You could now use the envelope tool to change the amount of the effect (or gain sliders for the whole track):
- on the second track, the center comes back when you drag the envelope down.
- on the first track, the side channels are attenuated, you'll prominently hear e.g. vocals, bass and drums (like soloing the second track).
There's a sample file in the topic that shows just this.


numerous effects can be treated like this--duplicate the track, apply the effect and invert it if necessary (reverb would work without that).

Some effects produce a delay though--you'll get a comb effect when playing the tracks together.

Thank for the tips.

Code: Select all

Effect parameter = (stereo field) rotation   range [-180;180] 

I guess I have to tweak this in order to rotate the panning but does it have to be exactly accurate to be effective ? I can approximatly determine by ear but checking the whole 360 degrees range seems tedious.
Is there an analysis plugin to find how things are panned not just by ear ?

French