After you’ve created 2 duplicate tracks, you can time-shift them, say +/- 10 milliseconds,
pan one full Left , pan the other full right , then you get a chorus-effect if you mix them with the original …
The chorus plugins can produce richer chorus-effect than doing it manually …
conspicuous-chorus.xml (507 Bytes)
Here’s Steve’s Chorus plugin which is specific for Audacity … Chorus Effect
It’s a Nyquist plugin , here’s how to install those …
http://manual.audacityteam.org/man/installing_effect_generator_and_analyzer_plug_ins_on_windows.html#nyquist_install