On the (first?) oshara story mission I take from Stormfall, after disabling the three generators, when the Alastor ambush happens, the horn sound effect is extremely loud... Kind of amazingly, really. It drowns out all other sounds (I think they might not even play?).

The horn also repeats, which may or may not be intended. The initial horn lasted a surprisingly long time as well, many seconds, so I'm not sure.

Cheers!