Hey guys, this may seem really insignificant or maybe a lot of you are already aware of it, but I had to mention it here anyway;
By default, Massive X loads the Init preset with the Asimov Filter on and this adds color and distortion to your signal even when the Filter Frequency is turned all the way to the right and no Resonance or Gain is being added.
I recommend turning the Filter off or switching it to the SVF Filter when building a new preset from scratch as the SVF filter adds no color or saturation to the signal.
You can see here in the Massive X user manual how these two Filters behave:
Anyway, hope this helps for those who were unaware of this :)
Thanks!