(Field, Underscore, Foley, Sound Bed, Overlay)
Taking a speaking voice as the most common guiding element of an audio walk, a question opens: what sounds surround the voice?
One option is to add no further sound, but most audio pieces—since they are experienced on headphones and so to some degree will eclipse the ambient noise of the actual place where the walker is walking—add layers of sound to the voice. Here are five different types of sound layers to consider.
FIELD
Many walks repeat the sound field of the walk in some way, whether the vocal recording is made as the speaker moves through the site, or by taking field recordings of the site and adding them as additional tracks in the editing interface. This move ensures that the site’s acoustic signature is baked into to the recording, restoring the site’s sound for the walker on headphones, or delivering the site’s sound to a listener who is not actually on the walk, or walking somewhere other than the site.
With Field layers, the possibility also exists to layer in fields that do not correlate 1:1 with the site. Here is the sound of this same bustling place in the middle of the night, or in winter while we are in summer, or during a famous event that took place here some time in the past. A further possibility exists of pairing sites, so that this city where the walker is walking is given an underwater acoustic field, treated as if it is supposed to be the actual audio signature of that place. Or a place where one is accustomed to hearing one language in the crowds and passersby, is now rendered in another language.
Here I am thinking of field sound as unmodified recordings of the world, taken as field recordings and embedded into the audio.
FOLEY
Foley is the name for the sound effects that make the noise of actions and objects. The sound of the car door slamming, the sound of bike tires skidding on gravel, etc. Foley is used to manifest events and discrete actions in sound. If the field is the wide surround, foley is near-sound, but in a different way than the voice is near.
(Many free foley type recordings can be found on Freesounds, for creative commons use.)
Consider also the possibility of magical or fantastical foley, like the blinky sound in a video game when your avatar runs through a coin, or the deflating siren of losing a life, or the light bulb ding of an idea in a cartoon. Almost anything could become foley if it is placed in such a way that says: this sound stands for this event.
UNDERSCORE
Underscoring creates a ground for a figure, taking the speaking voice in an audio walk as the figure in the foreground. Underscoring, usually musical or sonorous in a musical way (even if a single, ominous note) recedes somewhat from your attention and directs your emotional experience. Think of scary scenes in movies, think of the moment when the weepy theme music enters again.
Underscore needn’t be so manipulative, but it does create a tone that tends to control the interpretive range of the experience.
SOUND BED
I think of sound bed as something that makes place as well as mood—often through loops, rhythms, meter. (In the field recording post, there is a section at the end on turning field recordings into loops to lift the verité into something more rhythmic.) I think of sound bed as the thing that conjures the environment without overdetermining what can happen or be felt within that environment. If underscoring is contour-fit to the dramatic movement of the narrative, a sound bed simply makes a space for events to occur in.
This sound bed vs underscore is a somewhat idiosyncratic differentiation, but whatever words you want to use, I find it useful to think about emotion-mood vs. place-ambience in these two abstract types of supporting sound. Place here is less literally rendered than it is in a field recording. Think of the lit up interior lines place of the Tron computer world, or the weird, limited sloshy otherworld space that Eleven moves through in Stranger Things.
If you want to take a theory-head excursion into thinking about the ways rhythmic sonority creates space, check out two chapters from Deleuze & Guattari’s A Thousand Plateaus: “The Smooth and the Striated” and “On the Refrain.” [Placeholder for a future reading on the usefulness of those to chapters for thinking place through rhythm and sound tag.]
OVERLAY
If underscoring and sound beds are there to support the foregrounding of the speaking voice, an overlay is something that, through audio but not through speech, is laid out as if on top of experienced environment. The singing in Viv Cunningham’s Shadow Walks comes to mind as an example. An acoustic equivalent to the graphics markup of images, the circles an arrows and yard lines on top of the replayed football footage, the augmented rainbow haloes of a TikTok filter. Play in thought experiments with this designation of under vs over. To me, overlay suggests a creative interpretation of a site, an effort to read it for the presence some particular element, or to offer that element as a way to maximize its significance for the walker.