Oh damn dude. Did you rip it from the N64 cart?
I haven't taken the time to listen to everything, but is it possible that the Chronoscepter uses the Fusion Cannon's firing sound? They're similar enough, and the game pitch shifted its own sounds all the time anyway. For what it's worth, I couldn't find a specific Chronoscepter sound from the PC version's files (unless it's named something incredibly ambiguous).