Custom key signatures with grand staff problem
Create a grand staff, piano for example. Create a custom key signature, eg 1 flat on the second space.
Place the key signature on the upper staff of the grand staff. It appears as A flat.
In the bass clef, it appears as C flat.
Is the solution – not to use a grand staff and to create two different key signatures, one with a flat on the second space, and the other with a flat on the top line, and assign them independently?
The problem is alluded to in the documentation in the context of clef change and [non]-transposition.