I have been synaesthetic ever since I can remember. In my case, I mainly see colours in symbols. I may have been seeing colours in sound frequencies as well, but I'm not too sure. When I see symbols, I sense colours in the shapes of them regardless of which colours they are actually written in. What is interesting is that I have clearer ideas about the colours of some symbols than those of some others. Recently, I have even discovered that I'm synaesthetic to certain types of pain because of my chronic nervous/dermatological condition. To me the pain has colours and shapes.