How about this?
This is the slower noise, when in Park. Power is on, engine not running. Keep like this for as long as all the power is on, or at least 3/4 mins which is how long I waited.
When press the start button to shut it off, it stops instantly.
When driving under electric only, or when in Drive but still stationary, it gets quicker.
When driving under ele power only and passing nearby reflective surfaces, it sounds far more clicky than pumpy.