"Starting with the Moog and adding other synthesizers and a collection of modules, some of them designed by Mr. Cecil, they created a massive semicircular piece of equipment..."

"... that took up a small room and weighed a ton. It could be programmed to create a vast array of original sounds and to modify and process the sounds of conventional musical instruments.... Mr. Cecil lived in an apartment above the studio so that he would be available to fix anything that might go wrong, day or night. 'I get a ring on the bell,' Mr. Cecil told Red Bull Music Academy in 2014. 'I look out; there’s my friend Ronnie and a guy who turns out to be Stevie Wonder in a green pistachio jumpsuit and what looks like my album under his arm. Ronnie says, "Hey, Malcolm, got somebody here who wants to see TONTO."' What started as a demonstration of TONTO for Mr. Wonder turned out to be a weekend-long recording experiment. Seventeen songs were recorded, and a collaboration was born. Over the next three years, TONTO became a significant sonic element of Mr. Wonder’s music on the albums 'Music of My Mind' and 'Talking Book,' both released in 1972, and their follow-ups, 'Innervisions' (1973) and 'Fulfillingness’ First Finale' (1974)."

From "Malcolm Cecil, Synthesizer Pioneer, Is Dead at 84/His massive machine, known as TONTO, helped transform the music in Stevie Wonder’s mind into classic albums like 'Innervisions'" (NYT).