What do colours sound like? Well, it depends what technology you use. This is a mind-boggling experiment in phenomenology:
Excerpt from Hack My Hearing (BBC Discovery/Frank Swain 11/3/14)
Please support the creators by listening to the full programme, which is currently available to stream here: www.bbc.co.uk/i/p01t5q2q/
and is well worth checking out.
Also, here is a link to Action on Hearing Loss (which is mentioned in the show): www.actiononhearingloss.org.uk/