MP3 Settings

Sampling Frequency : a higher sampling frequency leads to higher quality and a larger file.

Channel Mode :Select Mono, Stereo, joint stereo, forced joint stereo, or Dual Channels Mode.

Current bitrate : a lower bitrate leads to poor quality and smaller file, higher bitrate leads to good quality and a larger file.

Encoder quality : choose the level of quality you want.

Advanced options: if you press this button you will show the right part of the dialogue which contains the advanced MP3 options.