IRIS

I had already received a CIA briefing detailing a cyber-terrorist group known as IRIS. They have now made their presence known.

An investigator found a hidden message inside the audio found at Exit-77.

The hidden message was found using audio software, something I had never heard of before. This is what they found:

At the date and time listed, the same investigator who discovered the flash drive at Exit-77 found a package, this one from the organization known as IRIS. Inside, he found this:

A roster of the company CBALtech, previously mentioned as Alec Veil's former employer, from the year 2000. Also included in the package were twelve letters, a correspondence between Alec and his former boss at CBALtech, Joseph Silva.

I'm not sure what order these letters are supposed to go in: