Hi I'm looking for a way to make a very deep but good sounding voice. I work in FL Studio so I've tried to use the pitch option and their options like speech etc. But it sounds so artificial. This is the example of what kind of voice I want to do from my recorded voice (male) or downloaded. Would you help me? I'm not an expert in this area.Lot of thanks for your advices!
It's interesting that to me your example doesn't sound natural at all. To me it seems that the sound was intentionally designed to sound unnatural. I guess "natural" is a pretty broad and somewhat subjective concept, so for simplicity we will define "more natural" as "inducing less change" and "less natural" as "inducing more change".
I can think of 4 ways to achieve that low-pitched voice: playback speed (aka a sampler's transpose), pitch shifting, frequency shifting, and formant manipulation. Each has its own sound, each will provide different results.
Your example sounds like something formant manipulation would do, but there is no way to know for sure without having the original voice sound as reference.
How to maintain a natural sound?
Which of these 4 techniques will sound more natural? It depends on you and how you implement them. One common approach to achieving very natural results is combining formant manipulation and pitch shifting. The human voice has some complex dynamics, and one of them is that there are specific resonances that remain constant no matter what note you sing. That's the timbre of your voice. When you use pitch shifting you will move those resonances too, something that doesn't happen in "real life".
After pitch shifting, you can compensate by moving those resonances where they belong to using formant manipulation (or maybe frequency shifting). Now you have changed the pitch of the voice, while leaving the natural resonances of the voice where they belong.
But that's my definition of "natural". It's clear that you have a different one. To answer your question more specifically you would need to define "artificial" and "natural" first. But by doing that you would limit your knowledge to that very small scope. What if you want to make something sound "artificial"? What if you want to go beyond "artificial" and "natural".
By knowing the tools you have available you can achieve any result you are looking for, without limiting yourself to a specific scope.
Here is an overview of four tools that will help you carve any voice sound you can think of, and more.
1) Reduce the playback speed
You can use a sampler to decrease the playback speed by either tweaking it explicitly (most samplers will have this function named as "transpose") or by playing the sample through a note lower than the one assigned to it.
This implementation has one particularity: your sample will become shorter or longer as you tweak its pitch, as pitch is being modified through the playback speed. Relationship between harmonics is conserved, and no harmonics are added or removed.
2) Pitch shifting
Change of pitch without changing the time. Some known tools that you can use to implement pitch shifting are: pitch correctors like Melodyne or Auto-Tune, synths capable of granular synthesis like Absynth, some DAWs have their own native implementation like Live's algorithms: beats, tones, texture, complex, and complex pro.
Here the result will vary depending in the tool and algorithm you used. In general, some new harmonics might be created, but their relationship will be the same: this musical transposition preserves the ratios of the harmonic frequencies that determine the sound's timbre
(here transpose will work as playback speed change if the Re-Pitch algorithm is selected, all other algorithms work as pitch shifting)
3) Frequency shifting
Here the transposition is made by the same amount, for every harmonic. Each harmonic is moved by the same distance. Therefore, the ratios between harmonics is not preserved. This is done using amplitude modulation.
The destruction of the original harmonic ratios can induce a lot of dissonance.
This is a more exotic effect, so you'll find it in more exotic tools like: Reaktor, SuperCollider, Pure Data, MAX. If you are not into that kind of stuff, there is a very simple implementation in Live, called simply "Frequency Shifter". I'm sure there are other simple simple frequency shift plug-ins, but I can't remember more at the moment.
4) Formant manipulation
Here the frequency of the first harmonic is conserved and some of the other harmonics are modified in pitch and/or amplitude. The fundamental frequency doesn't change, but the timbre does. This is similar to how a string will sound different if played in different-sized guitars. Small guitars will tend to amplify higher harmonics, and bigger guitars will tend to amplify lower harmonics. Also similar to what helium does to your voice (do not try it at home!).
It's also similar to why and how the middle C sounds different if singed by Barry White than if singed by Mariah Carey.
You'll find this dynamic also called "throat", "throat size", "throat length", "formants", or something similar. You will commonly find formant manipulation in pitch correction tools like Auto-Tune and Melodyne.
Find which implementations of these techniques you like the most. There are countless out there. Same techniques on different implementations can have very different results.
Sounds like that's an ordinary voice that's been 'slowed down'. If you record it at a faster speed, and play it back normally, it'll sound like that.On the original recording you'll have to speak/sing faster, though. Obviously these days, all this can be done digitally, but if you want your voice to sound like this on a normal day, a new larynx may be in order.