You need 6 flavors of sound (1 for each color) and a mechanism for distinguishing the colors on 9 squares on each face, I think? This is assuming we're only lis

You need 6 flavors of sound (1 for each color) and a mechanism for distinguishing the colors on 9 squares on each face, I think? This is assuming we're only listening to 1 face at a time. Perhaps I'm thinking about this too linearly. You could touch one square to hear its color, and its immediate neighbors would sound as well, with stereo/spatial effects to indicate their relative position.