Settings — Audio

The Audio tab has four volume sliders. Each is a normalised 0.0–1.0 multiplier applied independently to its sound bus.

Volume sliders

Engine Volume

Default 0.40.

Controls in-race engine sounds — the multi-car procedural engine synth + WAV sample mixer. This is the loudest channel by default; the 40% default is to keep it from drowning out commentary and radio chatter.

Rule of thumb: if you find yourself turning UP engine to hear cars on track, leave it at 0.40 and turn DOWN the other channels instead — the mix is calibrated relative to engine.

Radio Volume

Default 1.00.

In-race radio voice clips (“box, box”, “engine warning”, etc.). MP3-decoded and mixed via cpal.

Set lower if you find the voice clips annoying or louder than commentary text.

Driver Volume

Default 0.90.

Per-driver radio chatter (commentary spoken by driver-character voices). Currently a placeholder for a future feature — most builds have this channel quiet by default.

Music Volume

Default 0.50.

Background music — currently used for:

• Grid presentation (musics/grid_pres.wav)
• Career menu / main menu loops
• Some career-mode transition cues

Set to 0.0 to disable music entirely without affecting other audio channels.

Reset Audio Defaults

The “Reset Defaults” button on the Audio tab restores:

• Engine 0.40
• Radio 1.00
• Driver 0.90
• Music 0.50

Save behaviour

Audio settings save to visuals/hud_preset.txt. Key=value:

engine_volume = 0.4000
radio_volume = 1.0000
driver_volume = 0.9000
music_volume = 0.5000

The Settings screen merges with existing keys — custom HUD preset values (font preferences, etc.) are preserved on save.

When to adjust each

Quick reference