Yes they are necessary. When I plug headphones in my computer the sound is really too strong when I go over about 30-40% of the volume control and each step is

Yes they are necessary. When I plug headphones in my computer the sound is really too strong when I go over about 30-40% of the volume control and each step is way too big. I use youtube and grooveshark's volume control when I have headphones and place it at about 50% so that I can have more control over my volume using the vol up/down keys on my keyboard.