Simple as that, the projectiles should have sound effects when they pass close by your ship, from allies or enemies, doesn’t matter, would add a bit of immersion rather than having the projectiles fly-by silently.
Would also be cool for the Coil Mortar so it can have artillery shells whistles when close, both for the target and for the one who fires them, that if the game will be able to handle the additional sound mayhem, imagine what it would be like to have Sk’Rah or Meson miss you, maybe later but something worth considering.