http://en.wikipedia.org/wiki/Synesthesia

http://www.medicalnewstoday.com/releases/92698.php

http://synesthete.org/

Hi NF92...just noticed that last one...may be the best...anyway if you're totally unaware of any details on this here's a start. A ton of stuff out there I'd say. Forums too maybe. Anyway...nice ta meet you and welcome to PC.