Configured by setting percentage values in FV hashmap. Look for sounds e.g. here and change the sounds/ directory accordingly. The script assumes you have mplayer (or just mpv) installed.
The play function iterates over keys from the explicitly defined hashmap, spawns players and saves their PIDs to PLAYER_PIDS array. The clean function simply kills all PIDs in this array. The script runs play and traps SIGINT signal, on which it runs clean and exits.