(1) The compensation of the several officers or grades of officers and other personnel of the Probation Department and the Psychiatric Department, if any, or the Court Services Department, shall be determined by the county board of any county not within a probation district or by the budget committee representative of all county boards of counties within any probation district. Department personnel shall also be paid their actual and necessary expenses incurred in the performance of their duties. The compensation and actual and necessary expenses shall be paid at least monthly out of the county treasury upon proper certification by the court.
     (2) For the purpose of paying the compensation and expenses of personnel of any Probation, Psychiatric or Court Services Department maintained by a probation district, the county treasurer of each of the less populous counties of the district shall pay its monthly pro rata share to the county treasurer of the county in the district having the largest population according to the most recent Federal census, who shall add his county’s share to the amounts so received and pay the compensation and expenses due to such personnel.
     (3) Personnel required to render Services to the circuit court in other matters in addition to proceedings under this Act may be separately compensated therefor under any applicable law. In the case of personnel of the Probation Departments required by this Act, the amount of compensation for services under this Act shall be specified by the county board or the budget committee of the probation district, as the case may be.