Ambient soundscape

A small ambience picker in the header. Pick a scene — Tavern, Forest, Dungeon, Storm, Sea — and every connected player at the table hears the same backdrop. Silence stops it.

How the audio is made

There are no audio assets in the repo. Each scene is a procedural recipe built from Web Audio nodes:

Scene	Recipe
Tavern	Brown noise → band-pass at ~360Hz with a slow LFO on the centre frequency, so the murmur swells like a room of people.
Forest	Pink noise → low-pass, with the occasional chirp synthesised as a short sine sweep.
Dungeon	Brown noise → tight low-pass at ~220Hz, plus a periodic synthesised water-drip.
Storm	Pink noise through a high-pass + low-pass pair, with an LFO on the low-pass cutoff so the rain breathes.
Sea	Brown noise → low-pass at ~800Hz with a slow LFO on the swell gain to imitate waves rising and falling.
Silence	Stops the current scene with a 0.6s fade-out.

The crossfade between scenes is 0.8s so transitions never click or crunch.

Sync model

• Picking a scene emits soundscape:set over Socket.IO. The server validates the payload and relays to every connected client. No persistence, no Chronicle entry — same pattern as dice rolls and reactions.
• The local origin is filtered out so the sender doesn’t re-trigger itself when its own broadcast bounces back.
• A new tab joining mid-session doesn’t auto-play the active scene — the server only relays new changes. (This is by design: browsers block audio without a user gesture, so the joiner picks something themselves once they’re at the keyboard.)

Volume and mute

Volume and mute are per-device. They live under the per-device preference namespace in localStorage (lod:pref:soundscape-volume and lod:pref:soundscape-muted), survive reloads, and aren’t part of the campaign backup.

Why no audio files?

• Nothing to license, nothing to fetch, nothing to keep the bundle small around.
• Adding a new scene is one function in src/utils/soundscape.js.
• The synth is intentionally crude — the goal is “something suggestive at low volume”, not realistic foley. If you want real ambience for a big session, route the same Bluetooth speaker from Spotify alongside.