IGN. He also noted that not all songs will have a Pro Mode guitar add-on, since there are certain guitar parts that "wouldn't rise to the level that they would need to have Pro Mode authoring."
Additionally, DeGooyer further explained the song importing process from previous Rock Band games. RB3 will recognize any existing tracks from RB1 and Lego Rock Band that may already be on your hard drive (or you can pay the $5 and $10 fees, respectively, to purchase keys to rip them), while RB2 tracks can be exported into the RB3 song library for a nominal fee -- DeGooyer said it will be more than $5, though.
Harmonix is also planning to add keyboard parts and Pro Mode support to old songs, and there will be a charge to purchase those updates, as well. Most likely, said DeGooyer, customers who've previously purchased a song will just get a discount on an updated version (instead of having to by the new version at full price). In the abstract, all these added fees might sound expensive, but they're still probably cheaper than real guitar lessons.
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