Comment on My Synesthesia Experience: the World and the Page by Rebekka K. Steg.
Really enjoyed this, I forgot to comment at the time. I have ticker-tape synesthesia, which sounds similar to some of what you describe. Basically I “read” all conversations around me as the ticker-tape at the bottom of a newscast (except for me it is in the top, left-hand corner of my view). The difficulty is that when more than one person speaks at the same time, the words will get mumbled on the ticker-tape, which can make it very difficult to stay focused when in loud environments.