It was an unreleased progressive training program, with sections of immediate feedback, and sections with only feedback after a certain amount of questions.
The secret sauce is kinda a glissando between sections to try and throw off your pitch memory.
there are people working on recreating this in a web page. There are also people who argue this is not Perfect pitch, but just well trained relative pitch. It did fade after no training for 3 months IIRC.
There was a a different study that showed Depakote possibly aiding learning perfect pitch as an adult. Don't go find some Depakote and cram music theory, Depakote could kill you.
