Gearbox (auto) when input into Reverse gearbox is making a groaning noise. I have owned my Outalnder since new 2010, it has 91k on the clock and has regularly been serviced? Any guidance please

 

Does the noise change or get louder with the speed increasing?
Is it an Automatic transmission, or the CVT design?
Fluid levels correct?
If you gather a bit of speed in Reverse and pop it into Neutral, does the noise continue?