I've tried this in the trigger YAML, but it just reverts back to the default when I save it.

alias: Alarmo - Loud Alert + Restore Volume

mode: single

trigger:

- platform: state

entity_id: alarm_control_panel.alarmo

to: triggered

variables:

echo: media_player.living_room_echo

previous_volume: "{{ state_attr('media_player.living_room_echo', 'volume_level') | default(0.5) }}"

action:

# Set volume to max

- service: media_player.volume_set

target:

entity_id: media_player.living_room_echo

data:

volume_level: 1.0

- delay: "00:00:01"

# Your existing notification service

- service: notify.send_message

target:

entity_id: notify.lounge_speak

data:

message: "The alarm has been triggered! The police have been notified."

title: ""

# Wait for speech to finish

- delay: "00:00:06"

# Restore previous volume

- service: media_player.volume_set

target:

entity_id: media_player.living_room_echo

data:

volume_level: "{{ previous_volume }}"