Konnected Alarm Panel - connect a wired alarm system to HA new in 0.70

Hardware
27

Hi,
I have just set my Konnected board up. The Binary sensors in HA are updating as expected. However I can’t get my siren to turn on. I have added the siren switch to my HA front end so I can easily switch it on and off, but when I do the siren doesn’t sound.
Unlike the instructional video my alarm system has several wires for the siren:
https://photos.app.goo.gl/PSs4p7e7fqKsg2bb7

Black = strobe
Blue = 0V
Red = Tamp
Green = Bell
White & Yellow = +12V

I ignored the strobe, 0v and tamp wires, and hooked up the white & yellow wires into the +12v port on the Konnected board. I put the green wire (Bell) into the - port as per the alarm instructions:
https://www.manualslib.com/manual/833866/Texecom-Veritas-8.html?page=13#manual

Here’s my HA config:

konnected:
  access_token: blahblahblah
  devices:
    - id: 8F238
      binary_sensors:
        - zone: 1
          type: door
          name: 'Back Door'
        - zone: 2
          type: door
          name: 'Front Door'
        - zone: 3
          type: vibration
          name: 'Bay Window Sensor'
        - zone: 4
          type: vibration
          name: 'Kitchen Sensor 1'
        - zone: 5
          type: vibration
          name: 'Kitchen Sensor 2'
      switches:
        - zone: out
          name: siren

Like I said the binary sensors are operating as expected.

I can’t think of anything I have done wrong, so why doesn’t the bell sound? Any pointers much appreciated!

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