Making Karaoke: cannot find Mono in last step


I am first time user of Audacity. Trying to make Karaoke of a song, using . i am executing following steps

  1. Open or Importing mp3 file into Audacity - no issue

  2. selecting whole song by double clicking. then clicking song name drop down, selecting Split stereo track and maekingtwo channels - no issue

  3. selecting bottom channel and inverting it - no issue

  4. when i am trying to Change the tracks to Mono, the option is not appearing at all in drop down. in both channels. screen shot is attached.

please help

  • BR

That “how to” is very out of date.
For up to date information about reducing (or isolating) vocals, please refer to this part of the Audacity manual: