I use the Kalmus edition which only has the expression "ff" in the first bar and "sempre ff" in bars 9-10 which I happily obey since I love playing the Metz loud :-) But I can't give it all the oomph I would like because my CPU can only manage a polyphony of about 350! :-(
This edition only has one note in the pedal to which I've added one more. I've assumed that the apostrophes in the text indicate that one should wait for the reverb to diminish before proceeding to the next section.