yeah i agree most hiphop hooks are overdubbed and not just using "chorus" effects but having the rapper/artist do multiple runs using diferent voices (lower,normal,higher,falceto(Sp?)). Similar effect to when they have a hype man/men on stage who known what words/phrases to double up on in order to create this effect live. You could possibly fake the overdubbing by pitching the vocal takes +/- and octave and then mix them in a group to get optimal results.
I double my vocals all the time in my tracks atelast twice sometimes three times. THen i will put slightly different effects on each layer and mute certain layers at random at different parts of the sequence in order to create more movement in my vocals especially if the vocal sample is only a small phrase or single words.
Link giving a better explanation of what i was referencing in my post, so im not jsut a tnuc lol
http://www.ehow.com/list_6710653_tips-r ... p-hop.html
Overdubbing
Overdubbing can be heard in almost every hip-hop song on the radio. Whether its artists such as Jay-Z, 50 Cent or Kanye West, hip-music is designed to create multiple voices and is not intended to be smooth. In fact, because of the simplicity of the music in rap and hip-hop music, it is very likely that there will be more vocal tracks than musical tracks. Overdubbing can consist of recording the main vocals on one track followed by "punching" or emphasizing words on the second track, then layering those with another set of louder vocals on the chorus (the selling point) of the song. Additionally, a singer may sing in intermittent spots on a hip-hop or rap song, adding the need for more overdub tracking. It is important that those seeking to record rap and hip-hop music listen to the overdubbing styles and strategies used in contemporary rap and hip-hop music.
Layering
Because hip-hop and rap music depend heavily upon percussive instrumentation, layering the drums or other percussive sounds are extremely important. For instance, claps and finger snaps should be recorded several times so that each layer of recording makes the claps or snaps sound big. This can also be done for snare-drum sounds. When layering crash sounds or cymbals, it is important to do them in certain spots in the songs -- perhaps before the chorus to heighten its effect. Layering includes understanding how to pan (or slide) the effects from speaker to speaker. Sliding claps to both speakers creates a larger stereo effect.
hope this helps mate!