B4 Left Hand Backward Tap
Place the hand trigger on the top of the Left hand (not the palm) and tap on a wall or object behind you, bring your arm forwards between each beat so it moves continuously.
B5 Right Hand High Backward Tap
Place the hand trigger on the top of the Right hand (not the palm) and tap on a wall or object behind you and above head height, bring your arm forwards between each beat so it moves continuously.