Hey Skip Jones, thanks for your answer.
But does that mean I've been using the program wrong?
Because, what I have noticed is that if I load some Kontakt instruments, the RAM goes very fast, even though according to I have 16 GB of RAM.
With this RAM, I can not add more than 15 tracks, even if I PURGE the samples in Kontakt. And I have seen many people on the Internet that with the same amount of RAM can have up to 40 or 60 tracks without problems.