Monitor microphone levels and positions so performances sound right.
Operates machines to reproduce tape recordings from master tapes: Consults charts to determine amount of tape needed, considering running time of master tape. Positions master tape in master-reproducing machine and mounts blank tape on spindle of tape-recording machine. Threads tapes through machines. Interconnects and starts machines to record selection on blank tape. Stops machines and reverses tape in recording machine to record second selection on reverse side of tape. Operates recording machine to play back reproduced recording to test quality of reproduced sound.