I have the Headcanon that sometimes when one of the androids gets unexpected overthrown with emotions, you will just hear some kind of static noises, like some beeboop or a loud screech, depending on the situation
And that this mostly happens to Nines, since he had/has the strongest programming (Literally no emotions, programmed to kill)
+ it mostly (or only) happens because of Gavin
Nines:*walking in the break room**wants to talk to Gavin about a case* Gavi-
Gavin: doing some idiot shit in the break room (like balancing a pen over his lip or something)
Nines: *sees it and finds it weirdly adorable (for some unknown reason)*
Nines: beeboop, boop bee??!
Gavin: *running after Nines*
Nines: A̵̰͝A̸͑A̵̮͆A̷A̷̺̅Ặ̶a̶a̷̢̛a̸̒à̵͎À̷̤a̶͑͜ă̵̝a̴ *static screeching*
Like the Voice module just not working correctly, because he can't quite process his emotions in time
(The other Androids just have more use to the emotional part that's why it rarely happens)