Soundgin

Remember the SoundGin? Here's a shot of it's UI editing console. Title link takes you to a good article on Retro Thing where I found the image. Note the Soundgin is hardware.

Soundgin

"The Soundgin is Serially controlled Sound Synthesizer in a PIC. It produces complex sound effects, synthesizer style music and English speech with an unlimited vocabulary. For use in manufactured electronics and home projects."

Available in an 18-Pin DIP or SOIC package.
2.0 to 5.0 Volts Operation
16Khz Sample Output Rate
2400 or 9600 Baud Serial Connection
6 Independently Controlled Voices
Amp, Freq, Ring Modulation
Hard Sync.
ADSR Envelopes
Musical Notes
English Phonemes
Sound Morphing

Title link takes you to more info, including samples. Via M. Altemark in the comments of this post.