Ohh, Revelation is one of my absolute favorite brass band pieces.
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Barry
It’s definitely an octave lower. My understanding of the dotted line is under the stave to indicate down and above to reverse that. The second euphonium part has a lot of straight metal muted pedals, and the 1st euph is largely open. One of my favourite Wilby pieces, it’s properly monumental, as you’d expect with a title like that!
If memory serves I believe the piece starts with a pianissimo pedal Ab (treble) for BBb bass. There are also pedals for the cornets.