Subliminal encoding

[Brokenwings]

On the audacity forum there are two different ways listed to produce a silent subliminal.

The first way, or the manual way (https://forum.audacityteam.org/viewtopi ... 13&t=53615)
This method produces a track with audible "tweets" and sounds, though no words are discernible.


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The second way, involves use of a plug-in (https://forum.audacityteam.org/viewtopi ... 42&t=58548).
This method produces a track that is truly silent.

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My question is, which method of encoding produces the best results?
I have experimented with both and have seen mixed results/limited success using both methods.

I Want to see if anyone else has experimented with these, or other encoding methods - And what success they have seen.

[JackDrago]

I have always had the best luck with a second audio track (or seperate left right tracks) about -32db below the main audio. Conscious audible to some listeners but very effective.

[Brokenwings]

After experimentation, I have found that using the first method(that produces the tweets)- to be more effective.
I have simply been turning the volume down to a point where the "tweets" are less obvious.

[Fizbin]

Both listed "methods" are essentially the same, but fed slightly different parameters. You can achieve the same results with each.
Note that there are other "true" methods, such as level control, masking, etc... Also note that these are not mutually exclusive - you can use multiple methods of encoding on the same source, and overlay them into the same result file.

[Maleko7]

I have been searching Audacity for a function which does the following. I know there is hardware to do this but I was hoping for software.

Assume a stereo track with music. Also a track with speech to be used as a subliminal.

The resulting track would be such that the audio track would always be some lower volume (perhaps -20db) from the values in the music track.

This means that during quiet parts of the music, the speech would still be the same -20db below the quiet music level.

[mistschaufel]

[JackDrago]

Envelope following is usually unnecessary for subliminals, just put it at -35db and add a noise track at -32db to cover it... adds a teeny bit of background noise but makes the subliminal inaudible during the quiet parts (if you care, slightly supraliminal suggestions can be just as effective as true subliminals)

[zapnosis]

Thank you or You, JackDrago. This was useful advice!

Regards
Z