Event information deconz with Xiaomi Cube

You could rename the ID in the REST API to cube_rotation. That way you separate the two sensors.

PUT http://ip-address:40850/api/restapi-key/sensors/46 and in the body:

{
  "name": "living_room_cube_rotation"
}

That would make these two sensors:

    "42": {
        "config": {
            "battery": 88,
            "on": true,
            "reachable": true,
            "temperature": 2200
        },
        "ep": 2,
        "etag": "bac52d206b56327d29293ebeb8f38fad",
        "manufacturername": "LUMI",
        "mode": 1,
        "modelid": "lumi.sensor_cube",
        "name": "living_room_cube",
        "state": {
            "buttonevent": 5000,
            "gesture": 5,
            "lastupdated": "2019-09-15T17:59:47"
        },
        "swversion": "20160407",
        "type": "ZHASwitch",
        "uniqueid": "00:15:8d:00:01:04:1d:e0-02-0012"
    },
    "46": {
        "config": {
            "battery": 88,
            "on": true,
            "reachable": true,
            "temperature": 2200
        },
        "ep": 3,
        "etag": "df9d650b630492cb4b077aaa6a7c6ca1",
        "manufacturername": "LUMI",
        "mode": 1,
        "modelid": "lumi.sensor_cube",
        "name": "living_room_cube_rotation",
        "state": {
            "buttonevent": 1416,
            "gesture": 7,
            "lastupdated": "2019-09-15T17:59:57"
        },
        "type": "ZHASwitch",
        "uniqueid": "00:15:8d:00:01:04:1d:e0-03-000c"
    }

And the volume automations:

---
# Turn the volume up in the living room with the Xiaomi Cube
#
alias: living_room_cube_turn_volume_up
initial_state: 'on'
trigger:
  platform: event
  event_type: deconz_event
  event_data:
    id: living_room_cube_rotation
condition:
  condition: template
  value_template: >
    {{ trigger.event.data.event | int > 0 }}
action:
  service: media_player.volume_set
  data_template:
    entity_id: media_player.woonkamer
    volume_level: >
      {% set state = states.media_player.woonkamer.attributes.volume_level + 0.02 -%}{{ state }}


---
# Turn the volume down in the living room with the Xiaomi Cube
#
alias: living_room_cube_turn_volume_down
initial_state: 'on'
trigger:
  platform: event
  event_type: deconz_event
  event_data:
    id: living_room_cube_rotation
condition:
  condition: template
  value_template: >
    {{ trigger.event.data.event | int < 0 }}
action:
  service: media_player.volume_set
  data_template:
    entity_id: media_player.woonkamer
    volume_level: >
      {% set state = states.media_player.woonkamer.attributes.volume_level - 0.02 %}
      {% if state <= 0 %}
        {% set state = 0 %}{{ state }}
      {% else %}
        {{ state }}
      {% endif %}