A system which controls a group of multiple arrays of actuator elements, each of the actuator elements comprising a moving element which moves between a first and a second extreme positions; the system including: a controller, configured to generate control commands for at least one array of a first subset of the multiple arrays in each individual cycle out of a series of sampling cycles, based on: (a) an obtained number of moving elements which, if released from the first extreme position during an intended cycle of the series of sampling cycles, enables production by the group of multiple arrays of actuator elements of a physical effect, at least one attribute of which corresponding to at least one characteristic of a digital input signal; and (b) information indicative of a state of moving elements in the at least one array of said first subset; the system being characterized in that it further comprises an interface configured to transfer the control commands to the at least one array of said first subset, thereby resulting in releasing from the first extreme position during the intended cycle of at least one moving element that is comprised in the at least one array of said first subset; wherein release of all moving elements of at least one restrained array of a second subset of the multiple arrays is prevented during the intended cycle by the interface transferring to the at least one restrained array restraining control commands which are generated by said controller; the restraining control commands being electric potentials applied to electrodes of the at least one restrained array such that a hold voltage of only just sufficient magnitude holds any of the moving elements within the at least one restrained array in either of the two extreme positions. a controller, configured to generate control commands for at least one array of a first subset of the multiple arrays in each individual cycle out of a series of sampling cycles, based on: (a) an obtained number of moving elements which, if released from the first extreme position during an intended cycle of the series of sampling cycles, enables production by the group of multiple arrays of actuator elements of a physical effect, at least one attribute of which corresponding to at least one characteristic of a digital input signal; and (b) information indicative of a state of moving elements in the at least one array of said first subset; (a) an obtained number of moving elements which, if released from the first extreme position during an intended cycle of the series of sampling cycles, enables production by the group of multiple arrays of actuator elements of a physical effect, at least one attribute of which corresponding to at least one characteristic of a digital input signal; and (b) information indicative of a state of moving elements in the at least one array of said first subset; the system being characterized in that it further comprises an interface configured to transfer the control commands to the at least one array of said first subset, thereby resulting in releasing from the first extreme position during the intended cycle of at least one moving element that is comprised in the at least one array of said first subset; wherein release of all moving elements of at least one restrained array of a second subset of the multiple arrays is prevented during the intended cycle by the interface transferring to the at least one restrained array restraining control commands which are generated by said controller; the restraining control commands being electric potentials applied to electrodes of the at least one restrained array such that a hold voltage of only just sufficient magnitude holds any of the moving elements within the at least one restrained array in either of the two extreme positions.