// create all of the zone attenuation objects
    let za_offset = 1;
    let zone_attenuation_data = [];
    for (const [room, roomData] of Object.entries(MAP.rooms)) {
        zones = new Set();
        for (const [room, roomData] of Object.entries(MAP.rooms)) {
            zones.add(room);
        }
        for (const [zone, coefficient] of Object.entries(roomData.attenuation_coefficients)) {
            zone_attenuation_data.push({
                'source-zone-id': zone_to_id[room],
                'listener-zone-id': zone_to_id[zone],
                'za-offset': za_offset++,
                'attenuation': coefficient
            });
            zones.delete(zone);            
        }
            
        // all 'self' zones and zones not specified.
        for (const zone of zones) {
            zone_attenuation_data.push({
                'source-zone-id': zone_to_id[room],
                'listener-zone-id': zone_to_id[zone],
                'za-offset': za_offset++,
                'attenuation': (room !== zone) ? 1.0 : 0.5
            });
        }
    }

    await fetch(space_url('/zone_attenuations'), {
        method: 'POST',
        headers: {
            'Content-type': 'application/json; charset=UTF-8' // Indicates the content 
        },
        body: JSON.stringify(zone_attenuation_data)
    });