esphome:
  on_boot:
    then:
      - mixer_speaker.apply_ducking:
          id: source_speaker_1_id
          decibel_reduction: 10
          duration: 1s

speaker:
  - platform: i2s_audio
    id: mixer_output_speaker_id
    i2s_audio_id: i2s_audio_bus
    dac_type: external
    i2s_dout_pin: ${dout_pin}
    bits_per_sample: 32bit
    channel: stereo
  - platform: mixer
    output_speaker: mixer_output_speaker_id
    bits_per_sample: 32
    num_channels: 2
    source_speakers:
      - id: source_speaker_1_id
      - id: source_speaker_2_id