Hello here, I just watch carefull all the last sections but seems that @Rick_Davidson forgot to untick the play on awake on all the AudioSource, I did being puzzled for that because my sounds came up little too quicker then expected, specially on the player health and on the enemy spawner, offcurse 
Hope it help and great tutorial as always.
Ah yes, I often miss the play on awake check box - thanks for noting this.
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