If you want to keep new listeners, having a show that sounds great is so important. Think about the first time you hit play on a podcast; if it sounds good, you'll keep listening. If it sounds like crap (lots of noise, echo, and un-even levels) you'll go find something else to listen to. You don't want to lose listeners because of poor audio quality, but at the same time, it can take awhile to learn how to use audio plugins (like EQs and compressors) correctly. Most audio editing apps (and even some video editing apps too) have stock plugins that can help you fix audio issues and enhance the quality of your recordings. There are also third-party plugins that you can buy, but are they worth the money? Can you make a podcast or video sound great just by using the stock plugins?