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Hello. My name is Tan.
The way the buzzer works is the long tone BEEEEEP is for over heat, the fast BEEp,beep,beep,beep this is no oil warning then lastly about every seconds the horn will beep one tiome then do it repeating every 30 seconds the is low warning.
So the fast beep is the sensor in the VRO pump. Since you have the VRO oiling side just unplug the harness on the VRO pump the fast beep will quit.
The long tobe BEEEEEEEp is over heat this will be the cooling system failing. Water pump, thermostat, pressure relief valve and finally a failed sensor on the cylinder head.
When was the last time you had the cooling system serviced?