Choral Public Domain Library

I feel I've got to plug my Worcestershire music history - by far the most easiest of the Ave Verums is good old Edward Elgar's Ave Verum. Very simple unison soprano, repeated in simple four part harmony. Then verse 2 same thing. Variation at the end but all very simple.

Can anyone tell me anything about this piece, especially with reference to the CPDL score of this piece. Who sings where, for example, and who's meant to sing the second line?? Speed I can pretty much work out for myself but I somehow don't think it's meant to be the speed of the MIDI file supplied?...