Make sure you double click the green flag, wait one second, then double click it again, or else the timing will be entirely out of wack and the whole song will sound like a 2,000 kilogram man fell over in a store full of bells!
Well first of all, I'd like to say WOW! I had no clue that note blocks were so hard! This is my first time doing a round with noteblocks and I'm really excited to work on more!