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sounds like a lifter is bleeding out or starving for oil at low revs
check oil level and oil pressure
if thats good lifter or tappet clearance next to check
is engine seviced regularly?
slugde build up can cause problems also
if V6 petrol see a lot of worn valve guides causing noise worse when warm and noise comes in and out at 1200RPM
tappet clearance issue noise would be there all the time
lifter can also come and go while holding revs up
possibly a wheel bearing or tyre noise from badly worn tyres
while driving in a straight line and noise is present change lanes or shimmy car left and right if noise gets worse or better wheel bearing problem
also if noise gets worse in normal town driving speed and gets less at higher freeway speeds check your wheel bearings