How to set rotation-noise on bone ?

[katori.gogo.go]

I tried

1."bone" --- link --- > "help object"

2.set rotation-noise on "help object"

result

"bone" rotate, automatically without using rotate parameter.

I wanna stop "bone" rotate automatically.

Please advise me !

[katori.gogo.go]

I solve my problem with setting rotation-noise on second,third,fourth,... bones .

I don't have to use first bone for motion control parameters.