how does the LFO works in the eMX61? I have been trying to make my own sound changing the waveform or the frequency and is not working, it sounds the same.

Please tell us exactly what you are doing, that is not working. What do you want to do?

The picture is not a MX61, just so you know...:)

of course I know men, I BUY one :p, the one that you are watching is the midi controller Taktile Triton (even has the name on it, the Taktile is not a synthesizer), what i am asking is that if I buy a midi controller like the triton or some DJ pads, can i take the sound of the yamaha and use it in an external midi controler? because it will be more confortable to use it and i can also use 2 instruments in the same scale because when you put the split buttun you use diferents instrument in diferent scales
https://youtu.be/Io8plY2UZko?t=10m49s

my other question is: how can i use Vycro MX to switch the instruments and sounds effects and arpeggios etc in cubase?
https://www.youtube.com/watch?v=L_y_WOTCrGo

next question how can I Personalize the 2 phisical Assign knobs? to change any vitual knobs, like wave from LFO or like FEG atack from Filter etc.

next i also didn't understand how can I personalize the Foot Control to control anything like Record in cubase or a control in the MX like the volume
https://youtu.be/mQEOfiNujLo?t=2m28s

and finally how does the LFO works in the MX61? because that's the one that I got, i have been trying and trying to understand how to create sounds from the oscillator and i don't get it, so please read and answer all that questions

of course I know men, I BUY one :p, the one that you are watching is the midi controller Taktile Triton (even has the name on it, the Taktile is not a synthesizer), what i am asking is that if I buy a midi controller like the triton or some DJ pads, can i take the sound of the yamaha and use it in an external midi controler? because it will be more confortable to use it and i can also use 2 instruments in the same scale because when you put the split buttun you use diferents instrument in diferent scales

The sound of the Yamaha MX will always come out of the MX - your external midi controller can trigger the MX - but the sound comes out of the MX a not the midi controller. The splits will only sound properly when you play on the MX keyboard.

Sorry we know nothing about your external controller, does it create splits? Sorry we don't know.
If you want to play split sounds on MX you will need to play MX keyboard directly. The SPLIT POINT is determined for those using the Yamaha MX as their keyboard controller. Does the Korg split?
Sorry I have no time to watch Korg videos you will need to figure it out on your own.

my other question is: how can i use Vycro MX to switch the instruments and sounds effects and arpeggios etc in cubase?

You use the VycroMX Performance Editor to create sounds for MX. Separately you connect to Cubase to record the sounds you've created. The VycroMX Editor allows you to select sounds for 16 Parts, Cubase allows you to record them as MIDI data. You can see in the video the user created many MIDI tracks which are MUTED and they are playing back the Audio Track (at the bottom). They have used MIXDOWN to create a final audio wave.

next question how can I Personalize the 2 phisical Assign knobs? to change any vitual knobs, like wave from LFO or like FEG atack from Filter etc.

Sorry, I don't understand the question.

next i also didn't understand how can I personalize the Foot Control to control anything like Record in cubase or a control in the MX like the volume

You need a Yamaha FC7 pedal
Plug it into the Foot Controller jack and you can just what is done in the video.

And finally how does the LFO works in the MX61? because that's the one that I got, i have been trying and trying to understand how to create sounds from the oscillator and i don't get it, so please read and answer all that questions

wow, The LFO does not make sounds. LFO stands for Low Frequency Oscillator... low means it oscillates at frequencies below the range of human hearing.

LFO creates a "rate", this rate can be used to modulate different components in the synthesizer engine.
If you apply the LFO to the Oscillator (pitch) the result is called Pitch Modulation - which we musicians refer to as Vibrato
If you apply the LFO to the Filter (timbre) the result is called Filter Modulation - which we musicians refer to as Wah-Wah
If you apply the LFO to the Amplifier (loudness) the result is called Amplitude Modulation - which we musicians refer to as Tremolo

Hope that helps.