That is true, and I'm glad to see that someone new to the fandom knows these things. You'd be surprised how many people think they are actual Vocaloids, or UTAUloids.
However, there is a difference between Neru and Haku and your fanloid. Neru and Haku can be pitchbends, but as stated before, that is frowned upon.
But, Neru and Haku also have actual configurations in the VOCALOID program. That is, by changing different factors in a voicebank, it is possible to create a new or different voice.
For example, OwataP is well know for using Haku and Neru in his songs. His Neru is the Miku config.
One of his more well-known songs, Tsumanne gives a good example of the settings he uses.
And another example of Neru's rin configuration is seen here, in a Love is War remix.
These kind of things are usually perferred to using an audio editing program, because a lot of people feel that it is a form of stealing, by taking someone else's work and pitching it, then claiming it as your own, or something new, despite the pitch change, is wrong.
woo. I went on a bit of a rant there. I do apologize. Good luck with whatever you decide.