Finals (and semi finals) were on four machines simultaneously. Player A was player 1 on machine 1, player 2 on machine 2, etc. Player B was player 2 on machine 1, player 3 on machine 2, etc. First player on each machine stepped up and played their first ball on their first machine. When all were done with ball 1 on their first machine, they moved to ball 1 on to their second machine, etc.
Coincidentally, this simultaneous play idea came up in this thread Best Event Format for Maximum TGP % with 2-3H Event as a way to maximize tgp in minimal time.