Actually, Belto Maxson was really behind the recording. Before you read any further. Check out
this post to make sure you know Belto Maxson's origins.
Belto's voice actor for both versions,
Bobby Maxson voiced that recording. This was an important sequence that Belto Maxson would be a part of before the character got cut. As the base was being raided, Tidus and company decided that they need to get someone on the intercom that speaks Al Bhed to warn survivors of the base raid. Rikku decided to stay with the main party because she cared about Yuna too much. Belto Maxson made a two hour long speech about how he knew Al Bhed, and said that he would repeat a warning in Al Bhed over and over. Here is a rare screen shot of that scene:
http://www.geocities.com/crapity2001/beltorules.txt