The Programmer was using a computer or other device with a keyboard when he made his announcement. You could hear the keys at the beginning before he started talking.

He might have moved the computer since then, but is it possible to pinpoint which room he was in at the time based on the sound waves found in that recording?

[It'd take some work if one didn't already have a database of unique sound waves. It's also debatable whether any sound waves in the recording are unique enough to only occur in certain parts of the campus. On the other hand, the Programmer may not have considered the possibility of having his location tracked that way. It's worth planting the idea in Ai's head.]