FNG here, really enjoying the site - it has added to my enjoyment of RS and learning already. I couldn't find an answer to this question. What is the purpose of non-DD songs? I see many comments saying they 'prefer non-DD' or offering both options. I understand that playing slow at 100% is really useful for learning, but I also like the DD option for learning new techniques/songs. What is the point of having non-DD? Doesn't a DD song include everything the non-DD does and then some? I can see if adding it is difficult, but why offer non or both versions - is there an advantage to the non-DD versions I am missing? PC user if that makes a difference. Thanks in advance, I just want to make sure I am not missing something here that could be useful.