ELECTRO-HARMONIX (EHX) TALKING PEDAL speech synthesizer

via this auction

Some shots of the inside below.

"VINTAGE 1970's EHX (Electro-harmonix) Talking Pedal (a speech synthesizer) - the first all black version in used but good clean working condition... Its one of "The 10 Strangest Vintage Effects of All Time": 'While honorable mention must be made to the Heil Talk Box (which provides guitarists with a tube that they stick in their mouths to duplicate the sound of a stomach being pumped and other barfy delights), the Electro-Harmonix Talking Pedal enables your guitar to speak through purely electronic means. Actually, it only produces “A-E-I-O-U” vowel sounds, but it does give a guitar an uncanny vocallike tonality that is reminiscent of Yoda speaking Cantonese.'
[by guitarworld[dot]com]

Jean Michel Jarre used it on "Chronologie 2" and "Calypso 3"."