It's 15 minutes to kick off in the match which will crown Liverpool's season and in a sound booth the size of a large broom cupboard in west London, sound engineer Adam Peri is making a final check on the buttons with which he will attempt to create the sense of a broiling, passionate, historic night at Anfield.
Each of the options - 'goal', 'miss', 'angry' and 'whistle' as well as 'clap', 'anticipation', 'home' and 'away' - are distinguishable by his own hand-written labels, though there's nothing homespun about the process of providing football's new soundtrack: 'audio augmentation' as they call it in the industry.