This initial introduction has been filtrered through an EQ compressor designed to imitate a telephone.
The backing music here is Anton Karas' zither music; specifically, "The Third Man" theme. 
The backing effects here are from the BBC: "Long low wind" and "Two men - Footsteps on Stone."
This is the sound of a british telephone ringing.
Also, please notice that the footsteps start when the radio goes off-- as Maxwell and the Nebbish stop to listen.
The E.B.B. voice mail system, and the old man's message, have been run through the Telephone EQ compressor.
The first sounds you hear are the skipping and clicking of old LP records.
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These sounds are a combination of an Irish tin whistle and several records in the UT sound archives of trains being played at
The atmospherics kick up a notch here with the inclusion of some very slow keyboard parts.
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Here's where the low-end texture starts to roll in-- these were didgeridoos, created by cutting lengths of PVC pipe of varying
The sounds of clanking metal are all that remains from an earlier inclusion, a small dialogue sample from the 1950s film "Doctor X."
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At this point, you can start to hear the bass work of Kurt Johnson, from the bands The Flying Luttenbachers and Lozenge.
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The sounds of breathing you're hearing here are actually from the keyboard itself, a mid-80s keyboard that had special buttons
These sounds are British telephone sound samples taken from the BBC sound effects library, slowed down to some degree.
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If you listen closely here, you can hear some compression and crossfading-- for the purposes of the radio play, I cut out 
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Here you can start to hear the sound effects of dogs howling, guns shooting, and some vocal overlay.
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The heartbeats in this section are from an old medical record entitled "Canine Heartbeats."  The record was designed to help
The layered voices in this section are my own and Dan's.
I love that the heartbeats speed up and the bass comes to the forefront in this section.  It really heightens the suspense.
At the same time, the voices start to fade to the background and become more indistinct, giving the feeling of claustrophobia.
I love the gradual exit of first the bass, then the voices, then the dogs, then one final gunshot.
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The background noise for this segment is an LP titled "Steam Railroading Under Thundering Skies."
This is a BBC sound effect: "Destruction of a Factory Chimney."
Ditto.
Actual handgun sound effects sounded to paltry and thin to use here- this is the sound of an anti-tank mortar round. 
This is another mortar round.
BBC: "Door opening, closing, and locking."