For transposing notes up and down an octave in PRV, I have a keyboard shortcut that I've set up as a keybinding, by assigning
Process-Transpose to Alt-T (an unused keybind)
First, Select notes to transpose (or an entire clip) - then Alt-T (my keybinding) which pops up the Transpose window,
then I click square brackets [ or ] to transpose up or down an octave.
It sounds like a lot, but once the keybind is set up, it's 2 quick keyboard commands to do a transpose.