A method of controlling vibration in a boom, the method comprising: providing a hydraulic actuator including a first chamber and a second chamber; detecting which of the first and the second chambers is a load holding chamber; selecting one of the first and the second chambers as a locked chamber; selecting another of the first and the second chambers as an active chamber; locking the locked chamber, wherein the load holding chamber is selected as the locked chamber, and wherein the locked chamber prevents drifting of the hydraulic actuator; measuring pressure ripples at the load holding chamber, or measuring first pressure ripples at the active chamber; transferring a vibration canceling fluid flow to the active chamber; characterized by the method further comprising: reducing a magnitude of the pressure ripples at the load holding chamber by the transferring of the vibration canceling fluid flow to the active chamber when measuring the pressure ripples at the load holding chamber; and reducing a magnitude of second pressure ripples at the load holding chamber by the transferring of the vibration canceling fluid flow to the active chamber when measuring the first pressure ripples at the active chamber; the method further comprising: generating a reference signal starting prior to transferring the vibration canceling fluid flow to the active chamber; deriving a variable from a characteristic measured from the hydraulic actuator; summing the reference signal and the variable and thereby deriving a control variable; and forming a flow characteristic of the vibration canceling fluid flow with the control variable. providing a hydraulic actuator including a first chamber and a second chamber; detecting which of the first and the second chambers is a load holding chamber; selecting one of the first and the second chambers as a locked chamber; selecting another of the first and the second chambers as an active chamber; locking the locked chamber, wherein the load holding chamber is selected as the locked chamber, and wherein the locked chamber prevents drifting of the hydraulic actuator; measuring pressure ripples at the load holding chamber, or measuring first pressure ripples at the active chamber; transferring a vibration canceling fluid flow to the active chamber; reducing a magnitude of the pressure ripples at the load holding chamber by the transferring of the vibration canceling fluid flow to the active chamber when measuring the pressure ripples at the load holding chamber; and reducing a magnitude of second pressure ripples at the load holding chamber by the transferring of the vibration canceling fluid flow to the active chamber when measuring the first pressure ripples at the active chamber; the method further comprising: generating a reference signal starting prior to transferring the vibration canceling fluid flow to the active chamber; deriving a variable from a characteristic measured from the hydraulic actuator; summing the reference signal and the variable and thereby deriving a control variable; and forming a flow characteristic of the vibration canceling fluid flow with the control variable. generating a reference signal starting prior to transferring the vibration canceling fluid flow to the active chamber; deriving a variable from a characteristic measured from the hydraulic actuator; summing the reference signal and the variable and thereby deriving a control variable; and forming a flow characteristic of the vibration canceling fluid flow with the control variable.