How to make a similar pod fire SFX like in Nier Automata?

[samlletas]

So when shooting in the game Nier Automata, there is a secondary SFX that plays alongside the bullets SFX, this SFX sounds kind of robotic and plays randomly which gives a pleasant variation to the shooting sound, here is a video that shows it in action (from 0:13 to 0:19):


I have tried using voice samples with a vocoder but I'm not able to get anywhere close. Would anyone have an idea on how to design something similar?