Flow Garden — real water recording

Asset: aquarium-water.wav
Title: Fish Tank Aquarium Water Filter Natural Sounds
Author: DudeAwesome
Source: https://freesound.org/people/DudeAwesome/sounds/386023/
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
License URL: https://creativecommons.org/licenses/by/4.0/
Public HQ audio: https://cdn.freesound.org/previews/386/386023_6885640-hq.mp3
Accessed: 2026-10-09

The author identifies this as a recording of their fish tank's water filter pump.
Flow Garden uses an excerpt of the publicly offered HQ recording, not the original
FLAC (which requires a Freesound login). No endorsement by the author is implied.

Changes: excerpt 00:12–01:14; gentle 85 Hz high-pass and 8 kHz low-pass;
resample to 24 kHz; two-second equal-power overlap at the loop join;
static level adjustment with peak headroom; export 60 seconds of stereo PCM WAV.
No synthetic bubbles, artificial drops, pitch shifts, or added reverberation.

Reproduction (FFmpeg plus Python standard library):
1. Decode the first 90 seconds of the public HQ audio to 44.1 kHz PCM WAV.
2. ffmpeg -i original.wav -af "highpass=f=85,lowpass=f=8000,atrim=start=12:end=74,asetpts=PTS-STARTPTS" -ar 24000 -c:a pcm_s16le filtered.wav
3. python tools/prepare_water_audio.py filtered.wav dist/assets/aquarium-water.wav qa/real-water-preview.wav

The adapted recording remains available under CC BY 4.0. Retain this attribution
when redistributing the sound or a project that contains it.