Most of the Japanese TV industry uses Final Cut Pro
which I managed to get the hang of though the very late nights working on the show - I had no idea what I was letting myself in for ^^;
After editing all the footage, we send the audio tracks to the folks who does whats known in the industry as "MA" or Multi Audio. They add any sound effects needed and also makes sure that narration and background music is balanced out. This process is also known as "Sei-on" .