Some guides still refer to the "Software Playthrough" option but it is no longer called that.

There are several pages that use the old name for this option when it has been [renamed ](https://github.com/audacity/audacity/commit/e283a27ad8f86408c450763963d56f81494703a9) to "audible input monitoring" or something like that.

See for example: https://github.com/audacity/audacity-support/blob/d93117a17397d0a87bdd8f030f427219d3f13275/basics/recording-desktop-audio.md?plain=1#L77

Search the audacity-support guides for references to "Software Playthrough", starting with basics/recording-desktop-audio.md at the cited section. Replace outdated references with the current option name confirmed by the linked Audacity commit, then verify no remaining guide pages use the old name.

Written by the indexing model from the issue text.