I was browsing youtube and came across this video that has a really good ambiance of the mod 6048 at the Rec-Plex, and the SD-10 about a mile or so away. Sirens start at 32 seconds. You can hear one of the whelens finished its voice announcement and you can hear the DTMF tones going out.
https://www.youtube.com/watch?v=4UNSxLNFOr4