Sounds like my old Nighthawk!
Yeah, that's a bit excessive for whine. It's probably the camchain, but also probably harmless.
Did it grow louder with time (thousands of miles) or did it get loud over the course of a few hundred miles, or did it suddenly start doing it?
Currently Running Stable:
2010 Honda NT700V
1986 Shadow 700
1986 Honda Trail 110 (Postie Bike)
1987 Honda Rebel 450
1973 Honda Mini Trail 50