Render effects to a separate track than original?

OS: Windows 8
Audacity Version: 2.0.3

I’m trying to create an effect generated from an original, and then further modify the resulting effect ONLY without modifying the original sound on the second effect.

For example (and please do not answer this specific example, a more general response would be most helpful):
Suppose I wanted to create an echo effect from an original voice sample. After the effect has been generated, suppose I wanted to adjust the equalization of the echo ONLY, so that the echo alone has more bass. I do not want to adjust equalization on the original sample along with the echo. I figure that rendering the effect to a separate track would do the trick, because the original sample wouldn’t be copied, only the resulting change. Would possibly taking a diff between the original and original+effect work also? I’m not sure how to do that either.

I have searched and haven’t seen a similar post or solution for this type of editing. If one exists, or if it’s in the help file somewhere, a link would be awesome!

Thank you for the amazing program!

There is an example of that type of editing here:

A couple of shortcuts that you may find useful:
Mix to new track: Ctrl+Shift+M
Duplicate track/selection: Ctrl+D

Thanks steve :slight_smile:

Although, while I enjoy the concept of GVerb and have used it many times, it doesn’t produce the effect that I’m interested in at this time, and I was seeking a more general solution to modifying any effect.

I just now did a bit reading into it though, and I was able to get what I needed using a “difference” approach. I suppose I’ll post what I did for others :slight_smile:

Duplicate the original track
Run the first desired effect on the duplicate track to create an original+effect track
Run the “Invert” effect on this original+effect track
Create another duplicate of the original track
Mix together the inverted original+effect track and the second duplicate of the original track
This produces a track separate from the original track that contains the effect only
When the original and effect tracks are mixed it will produce an identical original+effect track

Simple math escapes me sometimes :blush:

Gverb was just an example of the technique of using a “dry” (original audio) track and a “wet” (processed duplicate) track, which can then be mixed together.
The technique can be used with many effects other than Gverb.

Some effects (such as the included “Phaser” effect) already have a “Mix” (wet/dry balance) control. If you want to use the “duplicate and mix” technique with this type of effect, set the mix to 100% Wet and apply to the duplicate track.

Some effects (such as “Equalization” and “Noise Removal”) are “all Wet” - that is, the output from the effect is only the processed signal, with no Wet/Dry mix option. For these types of effect, just apply the effect to the duplicate track and mix as required with the original (dry) track.

The third type of effect are those that simply add the effect to the original audio (such as the “Echo” effect).
In these cases there is a neat trick that can often be used which is a bit quicker than the method you describe:

  1. Duplicate the track
  2. Apply the effect to the duplicate track.
  3. Invert the processed (Wet) duplicate.
  4. Mix the original Dry track and inverted Wet track as required.
    A 50/50 mix of the two tracks will “cancel out” the dry part of the mix. Unequal amounts of Dry/Wet in the mix will result in a mix of Dry and Wet. If you mix more Wet than Dry, then the “Dry” component of the mix will be inverted compared to the original. If you mix less Wet than Dry, then the “Dry” component will be attenuated but not inverted. In other words, you don’t really need to create the third (inverted) track.

As you say it’s just arithmetics really (or “math” as I think you call it across the water :wink: