Both a single-line text input form
and a multi-line text input form are available.
They offer more functionality, like eg. viewing the phonemes
that get generated for a phrase.
Even more functionality is available via an experimental interface
that can return both phonemes and speech.
It is the
result of some experiments with MIME multipart messages.
Background information about rsynth and about this gateway (What? Who? Why? Where? How? - all you ever wanted to know about Say...) is available.
Say... has been nominated in the `Most Technical Merit' category of the Best of the Web '94 Award.