klattsch is a parallel-formant speech synthesizer: you type phonemes and the computer talks, and sings. this is a real port of the basic functionality of klattsch to MS-DOS, running in an emulator in your browser. you can also download it and run it on a real machine.
loads a ~2.5 MB DOS emulator
type ARPABET phonemes and press Enter or click speak. try HH AH L OW, or hit a canned song. F1 is the syntax reference, F2 is about. the tile grid auditions single phonemes.
klattsch for desktop and android has a piano roll editor and even more cool stuff. go try it!