My Urbie K-9 hero's siren doesn't always make the sound for me. Some matches it isn't too bad but the other day I had it skip the audio quite frequently. I'm guessing it is a client thing where "too many" audio events are happening or the server/connection was struggling (due to it being worse for one match than others, for example).
"Literally Unplayable" (har har but still, I likes me some hot siren action after sneaking up behind an unsuspecting mech).
Also, I am not talking about when I'm mashing too many keys with my face so the siren trigger doesn't even activate. I'm talking about when the lights do work but the audio does not...for me (I can't say if others hear it when I do not).
Cheers!
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Fivehole