Great idea isn't it, colour coding the jack sockets. I'm colour-blind...and aren't those little symbols, well, little!

(Our local council did the same with the bin collection rota: general rubbish bin one week, recycling stuff next week, every other week with the garden rubbish, all carefully colour-coded for the year ahead. I hadn't got a clue. Seemed they cottoned on - now they use different B&W symbols).