Just as in Joseph story we all go through low points when we are consumed by hurt, pain and unforgiveness. What can we possibly do in moments like these but wait on God to finish our story? Joseph brothers hated him, they sold him, he became a slave, got promoted, ended up in jail due to a false accusation.
My tone of voice would not change in recording this episode and I attempted it twice, I was going through a low point while I was recording as well, however, I hope you can pull as much lessons as possible from this point in the story. Going through it is no excuse to do sloppy work and not do your best regardless of the task or position you are in.