The document discusses four audio experiments - one where the volume was raised loudly, one where the volume was lowered quietly, one where the volume changed throughout by raising and lowering, and one where the volume was raised only slightly.

1. In this one I raised
the volume so it is
louder
In this one I lowerd
the level and at one
point made it as low
as it could be so the
sound would be quiet
In this one I raised the
volume so it is louder but o
did many point so it would
be changing volume and I
put it lower at the end so it
would be quieter
In this one I raised it a
little so it would be a bit
louder but largely the
same