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Simultaneous doesn't matter at all. I rarely, almost never, hit the 6 and the B at the same time on my JFs. It's just about hitting the 3 inputs in a short window. For me it's always easier to hit the 66 as fast as possible and then hit B, rather than try and time the last 2 together.But as long as you are getting 66B and 66:B, the problem is that the second 6 and the B are not simultaneously. Just aim to hit them at the exact same moment, it's not hard because you are hitting them with different hands.