FWIW I have expanded Dual Mode Sounds to handle preon, out, in, pstoff sounds so that odd files are selected when the saber is pointed up and even files are selected when the saber is pointed down. This would let you pair even sounds and odd sounds together regardless of if there are the same number or not AND let you have completely unique effects for each by building the style to use IsLessThan<BladeAngle<>,Int<16384>>.
More info here: Sneak Peek - Dual Mode Ignition Sounds for ProffieOS6 - #2 by Fett263