The Collaborative International Dictionary
Volti subito
Volti \Vol"ti\, imperative. [It., fr. voltare to turn. See Volt a tread.] (Mus.) Turn, that is, turn over the leaf.
Volti subito [It.] (Mus.), turn over quickly.
Wiktionary
volti subito
vb. (label en music) A direction to quickly turn the page.