Push Square: 'It’s always about the graphics, isn’t it? Video games are, by their very nature, a visual medium – and we tend to judge technical progress by the number of polygons or pixels being displayed on screen. We analyse in deep detail the lighting, the resolution – heck, the rise of Digital Foundry means that even a release's framerate has become a popular point of conversation. But what we see on screen is only half of the illusion – it would count for little without sound. So why it so often overlooked?'