How to invert the frequencies in a Sample in LMMS?

[Selartos]

Not meaning reversing, inverting is more like for example when the frequencies in a Sample look like :

/\

and then turns into :

\/

This is extreme important for a professional mixing and mastering! To get what i mean check this incredible professional tutorial that explains it :
(It starts at 9:03, to get directly to my point skip to 10:08, but i will also strongly recommend you to watch and learn from the whole Tutorial)

https://www.youtube.com/watch?v=RNxhfTKIrew

For your answers i'm waiting and thank you very much in advanced!

[musikbear]

How to invert the frequencies in a Sample in LMMS?

That is easy :
Not possible!
..Aua
What then -then
Audacity!
Audacity has a 'flipping' tool, lmms would need to have audio-file editing capabilities, that is on wait. So Flipping an audio-track, will not be possible soon.
But Phase is part of many VSTs and also 3OC and zasfx at least -has phase-control.
Remember -here in his pro-studio, he is only addressing sound-files. Phase-mudder is equally important in instrument-usage. Then you need a tool like SPAN to see conflicts, and then you need to shift phase.
( One issue is that LMMS also not can do true-mono! Im in doubt that the output using 'Stereo-tools' is really mono, as in true-mono, but i have a plan to actually get the answer. )

-------------
Hmm.. not sure his recording is honest..
Listen: https://soundcloud.com/musikbear/stereo-mymono-hismono
When i convert that phrase to mono in Audacity, i can still hear the piano, and if you listen carefully, it is also audible in his own mono (3. segment in demo) -But WHY did he change phrase?!
That's so wrong!