this machine have a pair of cabinets and for 2 player play, both player play the same song they already chose although the difficulty can be different if they play in vs mode (they play on sync mode)
Keep practicing. Listen to the taps on RU-vid. You'll get used to it, and you can get an S :) (As a proof, I got B at first attempt at expert, 1 month later I got SS on expert and got an A on Master) Practice makes perfect.