Traditional / experimental practice

Unseen Creatures · The Bat's Hunt

The calls of a big brown bat hunting, 100 times slower: both time and frequency (like playing a recording slowly). Searching in the open, searching among trees, approach and the final buzz of more than 160 calls a second. After each call comes its echo from the prey; as the prey gets closer the echo comes sooner. The start of each sweep and the distances are representative. Not a recording: a representative synthesis built from the measurements in the sources. There is no claim of any effect.

5 minNo headphones neededEvidence level S: Soundscape, no claim

Liner notes

Bed: Brown noise, Pink noise
Strikes: Call ×2
What do you hear?: hissy · swelling · wide

4 layers, 2 sound engines; generated on this device every time it plays.

How is this sound made?

Brown noise−36 dB
Pink noise−46 dB
Call−24 dB
Call · pure tone, 47 calls, 200-650 Hz
Call−24 dB
Call · pure tone, 47 calls, 200-650 Hz

Reverb: room, 16% mix

In the room you can listen to each layer on its own, change its settings and save it as your own recipe.

Sound is generated on this device in real time; no files are downloaded from a server. There is a 2 s fade-in at the start and a 0 min fade-out at the end.

Compare with another sound

Hear both at the same loudness; drag the slider to the middle and they blend.

In the middle the two sounds truly blend; loudness is matched.

B: neighbours on the map

Another sound

What do we know, what don't we know?

S · Soundscape, no claim

No health or mental-effect claim at all; it is simply a soundscape.

This session isn't linked to any claim of effect.

A session's level is the weakest of its linked claims; it is never raised by a strong but unrelated claim.

Its neighbours on the map

The five sounds closest to this one by measured sound features.

See on the map

Keep your device volume comfortable, preferably below 60%. You can also use your device's headphone-safety settings.