Shopkeeper gets loudspeaker filter when an item is bought and a hero voice line are playing at the same time.

[puppygirlthings]

View attachment hi.mp4

More often than not, when a hero is in the middle of saying something over the radio and purchases an item, the shopkeeper will get the loudspeaker filter over their dialogue too. This also happens with hero intro voice lines that get interrupted during startup, with the patron inheriting the loudspeaker filter in that instance too, but someone had already documented that.