Audio sources & licenses

These audio assets are independently licensed recordings and foley, not extracted from commercial games. No endorsement by their creators is implied. Source licenses apply to the audio files, not the game's source code.

License references: CC0 1.0, Creative Commons Attribution 3.0 and Creative Commons Attribution 4.0.

• S31-16 Tommy gun busts; machine gun — craigsmith (USC Cinema transfers of Hollywood optical/magnetic effects, 1930s–60s). CC0. Three single reports (thompson-0/1/2) spliced from the bursts: the attack of a burst's first shot (from silence) joined at 76 ms with an 8 ms crossfade to the tail of a burst's last shot; 3 ms fade-in, 60 ms fade-out, peak-normalised, 44.1 kHz Ogg Vorbis. Burst cadence in the recording is 85–100 ms (about 650 rpm), consistent with a Thompson.
• The Free Firearm Sound Library — Ben Jaszczak, Brian Nelson, Kevin Heras, Matthew Nanney. CC0. Prepared samples: 1911/A_42P.wav → pistol (0.929–2.579s); 1917/B_16P.wav → rifle-a (0.594–2.994s); Arisaka/E_18P.wav → rifle-b (0.349–2.749s); PPSh/P_16P.wav → automatic (0.280–1.580s). Trimmed, resampled to 44.1kHz, encoded to Ogg Vorbis. The Colt uses an actual 1911 recording; Garand/BAR/Springfield use recorded substitutes (the PPSh burst now only serves near-miss snaps), not exact model matches. British and German guns, from the same library (first report of each file, trimmed with a 3 ms fade-in and a fade-out over the tail, peak-normalised to −1 dB, 44.1 kHz Ogg Vorbis): Mosin Nagant/M_26P.wav → enfield (Lee-Enfield No.4 and No.4 (T), 2.4 s); Mosin Nagant/M_21P.wav → bren (1.1 s); Tikka/W_24P.wav → kar98k (Kar98k and Zf 39, 2.4 s); AK-47/C_28P.wav → mg42 (0.45 s, played at the MG 42’s 1,200 rpm); Carl Gustav M45/G_20P.wav → sten and Carl Gustav M45/G_31P.wav → mp40 (0.9 s; a 9 mm open-bolt submachine gun); Smith & Wesson 642/V_22P.wav → revolver (a .38 double-action revolver, for the Enfield No.2, 1.6 s); Walther PPQ/X_31P.wav → p38 (a 9 mm Walther, 1.6 s). All are recorded substitutes of comparable guns, not the exact WWII models.
• Gun reload sounds — SpringySpringo. CC0. gunreload1.wav and shotguncock.wav → reload/bolt, encoded to Ogg. Recorded airsoft handling foley, not authentic WWII mechanisms.
• 31 pings and metal filing sounds — bart. CC0. Marker #1, first 0.8s, encoded to Ogg. Metal-ring substitute for the Garand clip, not a model-specific clip recording.
• 75 CC0 breaking / falling / hit sfx — rubberduck. CC0. bfh1_glass_breaking_01.ogg, _03 and _06, unchanged files renamed glass-0/1/2. Recorded glass breaking, used for shattering window panes.
• 25 CC0 bang / firework SFX — rubberduck. CC0. cannon_01.ogg and cannon_03.ogg, unchanged files renamed explosion-a/b. Recorded firework-derived explosive foley, used for explosions, cannon and background AA/flak.
• Rain (loopable) — Ylmir. CC0. 1.ogg, re-encoded to Ogg Vorbis. Rain recording edited to loop.
• Thunder, Very Close, Rain, 01.wav — InspectorJ. CC BY 3.0. Recorded thunder/rain, encoded to Ogg Vorbis. Used with variable playback rate, gain and filtering.
• Airplane Prop Loop — jakobthiesen; loop edited by AntumDeluge. CC BY 3.0. airplane_prop.ogg, unchanged file renamed airplane. Propeller recording; not a B-17-specific recording.
• Engine-loop heavy vehicle/tank — Nayckron, with qubodup. CC BY 3.0. engine_heavy_loop.ogg, unchanged file renamed engine. Car-engine-derived heavy vehicle loop; not an authentic Sherman engine recording.
• Wind Loop — Jonathan Shaw (InspectorJ); loop edited by AntumDeluge. CC BY 3.0. wind-01.ogg, unchanged file renamed wind. Original: InspectorJ wind recording.
• Footsteps on different surfaces — mastered by congusbongus for C-Dogs SDL. Selected variants 0–3, unchanged Ogg files. Original authors: swuing (concrete, wood, grass), EminYILDIRIM (Water Footsteps, with swuing's concrete), Eelke (boots on aluminum ladder). CC BY 3.0 per supplied licenses, preserved in each surface folder. Additional impacts/hurt/near-miss cues reuse these recordings as foley, not field recordings of bullet impacts or injury.
• The upstream Freesound pages for swuing, EminYILDIRIM and Eelke currently identify their recordings as CC BY 4.0; the distributed C-Dogs/OpenGameArt package identifies its mastered versions as CC BY 3.0. Both notices and links are retained here. Unused included gravel variants are by Ali_6868, CC0, from Gravel Footsteps.
• 4 dry snow steps — Iwan “qubodup” Gabovitch. CC0. Snow recordings 01–04, raised 12dB and encoded to Ogg Vorbis. Original notes retained with the files.

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