One thing that I'm not sure if someone pointed out before, but for quite a bit now(since late 2010's), the audio for the finale scene has been "incomplete", in that not all of the Figment voice speakers are working for the song.
From what I observed, each speaker for Figment's lines plays a different take/tone, some are more higher pitched and some are more lower pitched. Videos back around 2002/2003 shown that there was a good mix of them and it was lively, but currently, there seems to be only around 2 or 3 of them working.
One of them is the deep toned/unenthusiastic Figment voice, which is playing towards the start of the scene, and it's what you primarily hear if you are sitting further back. It's quite hilarious to me when there is a hold up like in this video where you hear that deep voice for the extended part of the song. It's also hilarious how the Channing moon projection will pause itself on Eric giving you a straight face after the first iteration of the song loop is over.
For comparison, here is a video from 2003 where the finale had all of its speakers working, it sounds much more lively: