If the engine is cold, it's possible it could be the Oil Pressure Tank for the Variators..!! Not easy from the recording to be sure, it could even be the exhaust tapping on something..?? Can you get it on a ramp, or locate under the bonnet..?? If you think it's engine, try a long screwdriver on the engine and the other end pressed up against your ear, keep moving the scewdriver around until you pick up the noise clearly..!!