I emailed Lansky with the answer in 2000 or 2001. Unfortunately I no longer have his reply, but the link to his "second computer piece, which has never been recorded (commercially released), and never will be" was to his 1976 piece "Artifice (On Ferdinand's Reflection)": <https://paul.mycpanel.princeton.edu/artifice.mp3>. The piece is also (publicly) available via <https://paul.mycpanel.princeton.edu/mymp3.html> and on UbuWeb with this little program note:

> Here is my very first speech piece, never recorded, done in 1976. The entire piece is made from a male and female speaker uttering the phrase "This music crept by me upon the waters". It's about 22 minutes long.