I dont know how to add recordings on FL and alter them, so I am searching for instruments pretty much made with programs like Sytrus and such that sound good x3

But I got good news, I made a choir myself by altering a sound that sounds like one, it will be featured in my new piece, The Symphony of Time (Melodic Dream Trance) :3

Actually, it's very easy to add and alter recordings in FL Studio :3 if it's already recorded, all you do is drag the file from windows explorer to the playlist. As for editing, what exactly do you intend to do to it? Another option for vocals would be to drag it to the step sequancer so that it has its own channel there, and basically play it like an instrument. This, however, would require that the audio starts at the very beginning of the file, and works best if the note of the audio in the file is C (this can easily be changed using NewTone). A THIRD option would be to take any such choir recording, and use slycex to get samples from it, and play the samples in slicex like any other instrument. Not values would not line up with the keys, you'll have to figure out what notes are where (it depends on the order of notes in the original recording) but it works quite nicely. (before chopping, I recommend using NewTone to change the rootnote of the recording to the root note of your song if it isn't the same already)