Remember it is the frequency that does the work. Not the settings.
You can't turn a devitalization frequency into a healing frequency by use of settings.
What the settings do is add more frequencies.
So if you have the right frequency, doesn't matter if you use a healing or killing shell.
If you have a frequency that is not the right frequency, but used with the right settings generates the right frequency, then the use of the correct shell does matter.
Why don't we know which setting to use, because most of the frequencies were not identified the way Rife did, but through other means. In some cases, the researcher did not record enough detail or have a clue which frequency did the job.
Harmonics is a wonderful thing, but masks which frequency is responsible for the work done.
For more details, please check: