To reduce the echo, start with an “Attack/Decay” of 75, “Gate threshold” of -30, and a “Level reduction” of -100. Make sure that Audacity is closed while doing this.
HOW TO GET RID OF ECHO IN AUDITION DOWNLOAD
HOW TO GET RID OF ECHO IN AUDITION FREE
There are lots of free Plug-ins for Audacity, but for this particular issue, Noise Gate is the one you need, as it helps improve the sound quality and can help reduce the echo.