Apple loops are NOT allowed at all.
If you submit them an audio mod will place a permanent ban on you so you wont be able to submit music.
Drum loops are allowed as long as you dont BLATANTLY use them. try chopping them and do some layering. throw in some of your own hits or a simple beat you made to go with it.
basically they want you to submit music that YOU CREATED not music you organized and pasted together.
hope that clears things up and welcome to the AUDIO PORTAL!
http://tmm43.newgrounds.com/news/
check out that link... its a database of EVERYTHING youll need to lurk through in order to get a better understanding of the audio portal.
And dont forget to have fun making music!