JR 8711 servo strange sounds maybe

[Pete Foy]

I was recommended to seek advice here so here I am.
I've only just started using digital servos and bought myself some JR8711's When I swapped the analog servos for the digitals I keep hearing like a violin sound when the transmitter sticks are moved and held in any position . The sound goes away when the servo is centered but increases in pitch when resistance is added to the moving surface. If I tap the moving surface when the servo is moved to a position and held there the noise also goes away which I guess means its slightly sticking.
The same situation is on all surfaces to a <> degree but is noticeable when high rate switches are flicked.

My question is: Is this a normal sound for digi servos or does it indicate a problem with the servo?

I know with analog servos theres a distinctive humming noise when load is applied especially when the surface binds which mine are not. I checked.

Sorry if this is a dumb question. New things take time to get used to.

Thanks for any help
Pete

[phippsj]

Yes, digital servos "sing" to you. I'm sure somebody else can explain all the gory details. Don't worry about it unless they start smoking!