"To change the selection to the next note in the same key track, hold the Ctrl (PC) /
Alt (Mac) while pressing left arrow or right arrow . Ctrl (PC) / Alt (Mac) up-arrow or down arrow moves
the selection to the next note in time."
I´m on Mac here and it´s the "Command"-Modifier that changes the selection....
grüsse nach berlin...
P.S.:
Don´t know if this is a bug or just not implemented:
selecting notes with cmd/shift & arrows is really handy, but i can´t deselect notes with that method. ( cmd/shift up-arrow selects more & more notes, cmd/shift down-arrow would deselect the last note).
I know that cmd/shift down-arrow extends the selection to the left side, but once you´ve started selecting to the right it does nothing (and vice versa if you started to the left direction).