Hi guys. I'm new to the whole controller scene, so I'm hoping you guys can help me out. I just purchased a used Traktor S4 from Guitarcenter.com. I read that the original user of a used S4 needs to unregister the product in order for the new person to use it. The controller I'm getting from GC doesn't come with Traktor Pro 2. I was planning on purchasing it. So, if I purchased Traktor Pro 2 and used it with the used S4 controller will I be able to use both products, register both products, and so on? I haven't received a response from GC, nor have I found any answer to my question surfing Google, NI forums, and so on. So yeah, any help will be great. Thanks guys.