I don't believe I'm playing this at 5:40am
Waterfalls start at chapter 13, time 35m 47s and runs for a few seconds into the launch just as the Saturn V clears the tower, then I stop the waterfall at 36m43s as record time as ran out. The whole scene would take minutes to do. Its best you download the Spectrum Lab and use it yourself.
Front Left
Front centre
Front right
Left surround
Right surround
LFE.1