I have music that's lossless and some that is 128 and 256 and some that is already 320. I like keeping my whole music collection on my iPod and my laptop hard drive is taking a hit as I have little space left on my hard drive. Is there a way I can covert my music without having to deal with duplicates (original and newly converted songs aka the way iTunes does it), or would I have to do it in groups of songs so my hard drive doesn't fill itself halfway through the whole process?