How can I change registers
Can you explain a bit more? Is this about registering/activating the Dorico application? Or maybe something totally different, like, I don’t know, organ stops?
Octave shifting for existing notes:
Octave shifting during note input:
If this isn’t what you’re looking for, yes please can you say a bit more about what you want to achieve, what you’ve got at the moment, etc so we can understand the context.
I am writing Brazilian music in bass clef for 7-string guitar. This is a popular way to write guitar music in Brazil and elsewhere. It works better than treble clef for the same reason that cellists play mostly bass clef–not so many unreadable ledger lines. Maybe I should have started with cello and changed the name from “Cello” to “7-string guitar.” I didn’t think of that until now. Is it the way I should go? It is a bit inconvenient, but any port in a storm as they say. Up til now I’ve been trying to use 7-string electric guitar. That has turned out to be a real mess.
You could start from a 6-string bass guitar and use edit strings and tuning to add an extra string and change the tuning. (Or create your own instrument … but I’ve not tried that yet)