Well, I managed to solve the last two problems of the last two posts I did (should I delete them?)
The thing is: The circuit worked perfectly (after, of course having mistakes like soldering wrongly a potentiometer, and other problems which were solved later.)
These are images of what I was seeing on the oscilloscope (Phaser circuit - input yellow vs output blue):
(if I'm not mistaken)
Everything on max (range of the LFO, ressonance, mix/ammount and speed of the LFO):

Maybe everything on minimum:

I don't kknow exactly the settings:

More zoom (yes bad connections):

LFO behaviour:


With the speed on maximum it behaves like this (which I don't care too much because it isn't even noticeable auditively, I suppose - it's 9 Hz of frequency):

All of this is just to say that the circuit works, everything seems fine for now. Next step is getting a "box" for it and delivering the right power, with true bypass, battery and 9V power switch, LED, which I will do when I have my hands on the "box". I already know how I will do the connections, and hopefully everything will go right.
So thank you soooo much to all of you who responded me here during the time I was here making questions.
Without you this would be absolutely nothing.