Exporting mp3

I recorded four tracks. Then I muted one. I exported to mp3. But I still hear the muted track. What did I do wrong? (I’m still using an old 1.2ish Audacity.)

Thanks in advance.

Upgrade. That doesn’t happen on my version 2 Audacity.

http://audacityteam.org/download/

Version 1.x is no longer supported.

Koz