This took a while, but here is (an example of) a result of that little experiment, with a subset of the letters!
The idea, from the start, is to have a wall with these sound letters on it. The desire here is to display the voices and spoken messages of the various contributors, laid down on paper, visible but unreadable.
One day, I might be able to transform this into a live interactive project, with a small printer that gives the letters live!
Anyhow, many thanks to all those who have participated so far.
Curious? You can still get your own letter by following @soundletterbot‘s instructions ;p
And I think now is a good time for a kind reminder that this is directly inspired from this, and you can read the story here!