So according to the sheets () or [] means I hit those keys at the same time and {} means I play it faster. So when playing the Lord of the Rings sheet it asks for [70ru] which when I hit all those keys at the same time it just doesn't go off. [80tu] works fine but not [70ru]

Then I got even more confused when I was expected to hit [680etu] all at the same time (which didn't go off either). So I don't know if I'm doing it wrong or not or if this is a bug