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heros_web/docs/audio-sources.md

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Audio Sources

Downloaded from Pixabay on 2026-06-22, 2026-07-21, 2026-07-22, and 2026-07-27 and used under the Pixabay Content License.

License reference: https://pixabay.com/service/license-summary/

Background Music

Project file Pixabay title Creator Source
src/assets/audio/bgm/title-theme.mp3 Chinese ancient music, World, Ethnic music ET11LX https://pixabay.com/music/china-chinese-ancient-style-music-love-et11lx-%E5%8F%A4%E9%A3%8E-%E6%8A%92%E6%83%85-%E8%AF%86-155926/
src/assets/audio/bgm/story-dark.mp3 Chinese, Asia, China music Reklamistrz https://pixabay.com/music/meditationspiritual-ancient-chinese-dali-448882/
src/assets/audio/bgm/oath-theme.mp3 Chinese ancient style, Ancient style, World music ET11LX https://pixabay.com/music/world-chinese-ancient-style-music-love-et%E5%8D%81%E4%B8%80lx-%E5%8F%A4%E9%A3%8E-%E6%8A%92%E6%83%85-%E8%AF%86%E4%B8%B0%E5%AF%8C%E9%85%8D%E5%99%A8%E6%8E%A8%E9%AB%98%E6%BD%AE%E7%89%88-247345/
src/assets/audio/bgm/militia-theme.mp3 Orchestra, Heroic, Warrior music NR-Music https://pixabay.com/music/adventure-short-heroic-orchestral-loop-541095/
src/assets/audio/bgm/battle-prep.mp3 Epic orchestral, War, Orchestral music Sonican https://pixabay.com/music/main-title-epic-for-war-orchestral-loop-364200/

Project-original Camp Soundscapes

The following files are generated deterministically by scripts/generate-camp-audio.mjs. They use only synthesized oscillators and seeded procedural noise; no external samples or copyrighted recordings are included.

Project file Role
src/assets/audio/bgm/camp-rally.mp3 Yellow Turban and anti-Dong Zhuo camp resolve theme
src/assets/audio/bgm/camp-wayfarer.mp3 Xuzhou, wandering, and Wolong camp theme
src/assets/audio/bgm/camp-grand-strategy.mp3 Red Cliffs through Yiling grand-strategy camp theme
src/assets/audio/bgm/camp-frontier.mp3 Nanzhong and Northern Expeditions frontier camp theme
src/assets/audio/ambience/campfire-ambience.mp3 Campfire bed for early and wandering camps
src/assets/audio/ambience/river-night-ambience.mp3 River-night bed for Red Cliffs, Jingzhou, and Yiling camps
src/assets/audio/ambience/mountain-wind-ambience.mp3 Mountain-wind bed for Wolong, Hanzhong, and Northern camps
src/assets/audio/ambience/nanzhong-night-ambience.mp3 Forest-night bed for Nanzhong camps

Daytime Exploration Ambience

The following source was downloaded from its official Pixabay detail page on 2026-07-27 and is used under the Pixabay Content License linked above.

Project file Role Pixabay title Creator Source
src/assets/audio/ambience/riverside-village-day-ambience.mp3 Daytime water-and-bird bed for the northern-village ferry exploration Stream Water with Birds loswin23 https://pixabay.com/sound-effects/nature-stream-water-with-birds-459511/

The 50-second source was reduced to a 32-second 44.1 kHz stereo MP3 loop. A two-second end-to-start equal-power blend avoids a hard seam, and the encoded track is balanced to -24.03 LUFS at 128 kbps. The final MP3 retains the title, creator, Pixabay Content License, and source URL in its metadata.

Battlefield Ambience and Tactical Cues

The source files in this section were downloaded from their official Pixabay detail pages on 2026-07-21. They use the Pixabay Content License linked above.

Project file Role Pixabay title Creator Source
src/assets/audio/ambience/battle-rain.mp3 Seamless battlefield rain bed Gentle Midday Rain DRAGON-STUDIO https://pixabay.com/sound-effects/nature-gentle-midday-rain-499668/
src/assets/audio/ambience/battle-fire.mp3 Seamless battlefield fire bed Fire Sounds DRAGON-STUDIO https://pixabay.com/sound-effects/film-special-effects-fire-sounds-405444/
src/assets/audio/sfx/ally-turn.mp3 Brighter two-beat allied turn cue Ancient War Drums DRAGON-STUDIO https://pixabay.com/sound-effects/musical-ancient-war-drums-463214/
src/assets/audio/sfx/enemy-turn.mp3 Lower, slower enemy turn cue Ancient War Drums DRAGON-STUDIO https://pixabay.com/sound-effects/musical-ancient-war-drums-463214/
src/assets/audio/sfx/operation-alert.mp3 Faster tactical event alert Ancient War Drums DRAGON-STUDIO https://pixabay.com/sound-effects/musical-ancient-war-drums-463214/
src/assets/audio/sfx/objective-success.mp3 Objective achieved signal Level Complete Universfield https://pixabay.com/sound-effects/film-special-effects-level-complete-143022/
src/assets/audio/sfx/objective-failure.mp3 Objective failed signal failure 1 Leszek_Szary (Freesound) https://pixabay.com/sound-effects/film-special-effects-failure-1-89170/

All seven files were resampled to 48 kHz stereo MP3. Tactical cues were silence-trimmed, equalized by role, and balanced to approximately -17.5 to -19 LUFS. The rain and fire recordings were reduced to stable excerpts, balanced near -25 LUFS, and rebuilt with a one-second end-to-start crossfade so repeated playback does not introduce a hard seam.

Battle playback uses track-specific loop trims for high-crest fire and mountain-wind recordings. Fallback volume is calculated from the measured integrated loudness of each active music-and-ambience pair, so quiet and loud BGM masters retain the same perceptual offset. Automated mix checks measure the actual encoded files across all 66 campaign battles and keep ambience 14-18 LU below its BGM; fire and snow-wind peaks must remain at least 1.5 dB below the paired music peak.

Narrative Interface Cues

The source file in this section was downloaded from its official Pixabay detail page on 2026-07-22 and uses the Pixabay Content License linked above.

Project file Role Pixabay title Creator Source
src/assets/audio/sfx/story-page-turn.mp3 Story page advance feedback Flipping Book Page DRAGON-STUDIO https://pixabay.com/sound-effects/film-special-effects-flipping-book-page-499646/

The narrative cue was resampled to 48 kHz stereo MP3, silence-trimmed to an approximately 1.0-second excerpt, fade-in/out processed, and high-pass and low-pass filtered for unobtrusive playback over story music.

Semantic Feedback Cues

The source files in this section were downloaded from their official Pixabay detail pages on 2026-07-22 and use the Pixabay Content License linked above.

Project file Role Pixabay title Creator Source
src/assets/audio/sfx/recovery-cue.mp3 Healing, supply, and terrain recovery feedback Holy Healing Spell Coghezzi https://pixabay.com/sound-effects/film-special-effects-holy-healing-spell-533279/
src/assets/audio/sfx/reward-reveal.mp3 Victory reward arrival feedback Reward Chime Universfield https://pixabay.com/sound-effects/film-special-effects-reward-chime-144757/
src/assets/audio/sfx/burn-tick.mp3 Batched burn-status damage feedback Electronic element burn spark 1 FxProSound https://pixabay.com/sound-effects/film-special-effects-electronic-element-burn-spark-1-248606/

All three cues were silence-trimmed, resampled to 48 kHz stereo MP3, fade-in/out processed, and high-pass and low-pass filtered. Recovery was reduced to approximately 1.9 seconds, reward reveal to 1.4 seconds, and burn damage to 0.7 seconds so feedback begins promptly and does not mask the next action.

Derived Terrain Movement One-shots

The following short movement clips were derived in-project on 2026-07-23 from the two Pixabay-licensed recordings already listed under Sound Effects. No additional recording was introduced. Each derivative retains the original creator and Pixabay detail-page URL in its MP3 artist/comment metadata, as well as in this document.

Project files Terrain role Parent project file Original creator Original source
src/assets/audio/sfx/footstep-earth-{1,2}.mp3 Foot movement on earth, plain, hill, or camp src/assets/audio/sfx/footstep-walk.mp3 vgraham1 (Freesound) https://pixabay.com/sound-effects/film-special-effects-walking-through-grass-80308/
src/assets/audio/sfx/footstep-stone-{1,2}.mp3 Foot movement on road, stone, fort, village, or cliff src/assets/audio/sfx/footstep-walk.mp3 vgraham1 (Freesound) https://pixabay.com/sound-effects/film-special-effects-walking-through-grass-80308/
src/assets/audio/sfx/footstep-wood-{1,2}.mp3 Foot movement through forest or across a wooden bridge src/assets/audio/sfx/footstep-walk.mp3 vgraham1 (Freesound) https://pixabay.com/sound-effects/film-special-effects-walking-through-grass-80308/
src/assets/audio/sfx/footstep-wet-{1,2}.mp3 Foot movement through river, water, marsh, or swamp src/assets/audio/sfx/footstep-walk.mp3 vgraham1 (Freesound) https://pixabay.com/sound-effects/film-special-effects-walking-through-grass-80308/
src/assets/audio/sfx/hoof-earth-{1,2}.mp3 Mounted movement on earth, plain, hill, or camp src/assets/audio/sfx/horse-gallop.mp3 DRAGON-STUDIO https://pixabay.com/sound-effects/nature-horse-gallop-sfx-339736/
src/assets/audio/sfx/hoof-stone-{1,2}.mp3 Mounted movement on road, stone, fort, village, or cliff src/assets/audio/sfx/horse-gallop.mp3 DRAGON-STUDIO https://pixabay.com/sound-effects/nature-horse-gallop-sfx-339736/
src/assets/audio/sfx/hoof-wood-{1,2}.mp3 Mounted movement through forest or across a wooden bridge src/assets/audio/sfx/horse-gallop.mp3 DRAGON-STUDIO https://pixabay.com/sound-effects/nature-horse-gallop-sfx-339736/
src/assets/audio/sfx/hoof-wet-{1,2}.mp3 Mounted movement through river, water, marsh, or swamp src/assets/audio/sfx/horse-gallop.mp3 DRAGON-STUDIO https://pixabay.com/sound-effects/nature-horse-gallop-sfx-339736/

The derivatives are 0.34-0.48 second one-shots. They were excerpted from separate points in the parent recordings, resampled to 48 kHz stereo MP3, given 8 ms attack and 55 ms release fades, terrain-specific EQ, and conservative loudness/peak balancing. Runtime playback samples surfaces across the full movement route, treats rain and passable river-bank/ford tiles as wet, prevents the same active clip from doubling, and caps foot and hoof groups at two voices each. Existing combat pools also use per-track gain compensation derived from integrated loudness measurements so randomized variants do not jump sharply in perceived level.

Sound Effects

Project file Pixabay title Creator Source
src/assets/audio/sfx/ui-select.mp3 Ui, Click, Retro sound effect SoundShelfStudio https://pixabay.com/sound-effects/film-special-effects-ui-click-retro-514601/
src/assets/audio/sfx/sword-slash.mp3 Sword, Slash, Swing sound effect DavidDumaisAudio https://pixabay.com/sound-effects/film-special-effects-sword-slash-and-swing-185432/
src/assets/audio/sfx/sword-swing-variant.mp3 Video game Sword swing SFX OxidVideos https://pixabay.com/sound-effects/film-special-effects-video-game-sword-swing-sfx-409364/
src/assets/audio/sfx/combat-impact.mp3 Sword, Slash, Weapon sound effect DavidDumaisAudio https://pixabay.com/sound-effects/film-special-effects-sword-slash-with-metal-shield-impact-185433/
src/assets/audio/sfx/armor-impact.mp3 Armor Impact from Sword DRAGON-STUDIO https://pixabay.com/sound-effects/film-special-effects-armor-impact-from-sword-393843/
src/assets/audio/sfx/shield-block.mp3 Shield Block Shortsword SectionSound https://pixabay.com/sound-effects/film-special-effects-shield-block-shortsword-143940/
src/assets/audio/sfx/bow-release.mp3 Bow Release (Bow and Arrow) 4 Ali_6868 (Freesound) https://pixabay.com/sound-effects/film-special-effects-bow-release-bow-and-arrow-4-101936/
src/assets/audio/sfx/arrow-swish.mp3 Arrow Swish_03 DJARTMUSIC https://pixabay.com/sound-effects/film-special-effects-arrow-swish-03-306040/
src/assets/audio/sfx/arrow-body-impact.mp3 Arrow Body Impact DennisH18 https://pixabay.com/sound-effects/film-special-effects-arrow-body-impact-146419/
src/assets/audio/sfx/arrow-wood-impact.mp3 Arrow Wood Impact DennisH18 https://pixabay.com/sound-effects/film-special-effects-arrow-wood-impact-146418/
src/assets/audio/sfx/critical-impact.mp3 Combat Impact Universfield https://pixabay.com/sound-effects/film-special-effects-combat-impact-352458/
src/assets/audio/sfx/critical-boom.mp3 Cinematic Impact Boom 05 Universfield https://pixabay.com/sound-effects/film-special-effects-cinematic-impact-boom-05-352465/
src/assets/audio/sfx/strategy-cast.mp3 Designed, Magic spell, Projectile sound effect RescopicSound https://pixabay.com/sound-effects/film-special-effects-elemental-magic-spell-impact-outgoing-228342/
src/assets/audio/sfx/cart-roll.mp3 Cart, Wheel, Cobblestones sound effect Fronbondi_Skegs https://pixabay.com/sound-effects/film-special-effects-foley-heavily-laden-cart-moving-over-cobblestones-sound-effect-246657/
src/assets/audio/sfx/exp-gain.mp3 Level up, Level up sound, Game level up sound effect Universfield https://pixabay.com/sound-effects/film-special-effects-level-up-06-370051/
src/assets/audio/sfx/footstep-walk.mp3 Walking, Grass, Footsteps sound effect vgraham1 (Freesound) https://pixabay.com/sound-effects/film-special-effects-walking-through-grass-80308/
src/assets/audio/sfx/horse-gallop.mp3 Horse, Galloping, Horse sound sound effect DRAGON-STUDIO https://pixabay.com/sound-effects/nature-horse-gallop-sfx-339736/