Here's a short and to the point tutorial teaching how to Bass Boost your songs with Audacity. To download Audacity for FREE you can go to the official Audacity website here - http://audacity.sourceforge.net/ You may want to Bass Boost your songs for many reasons, so here's a tutorial on how to do just that with the popular, Free, and easy to use software called Audacity.
Step 1: Download Audacity
The first thing you want to do if you haven't already, is download Audacity. Again, Audacity is completely free to download and use so here's a link to their website - http://audacity.sourceforge.net/
Step 2: Import your Song into Audacity
Now you must import your desired song. To do this just click "file" then "open" and select the song or sound that you would like to boost the bass of.
Step 3: Normalize the Song
Next, open up Audacity and click the effects tab. A drop down menu will pop up. From the drop down menu, find the setting called "normalize". Click normalize and a small window should pop up. It will give you the options to how much you want to normalize. The best setting for this is between -9.0 and -15.0. If these levels don't fit your needs, adjust until you get the desired level and click "ok". The waves should now appear smaller than they first did when you imported the song into Audacity.
Step 4: Adjusting Bass Levels
Now to boost the song, click the effects tab again and click the "Bass and Treble" setting. This will open up another smaller window in Audacity giving the options to adjust the bass and treble levels. Keep the treble at zero and adjust the bass until it fits your needs. You can always click the preview button to make sure your'e satisfied and then click "ok".
Step 5: Exporting Your Bass Boosted Song
Now on to exporting your new sound file. To do this go to "file" and then "export". Choose your desired format and click "save". Another small window will pop up so just click "ok". This will save your new bass boosted sound file! Now you can close out of Audacity and listen to your new improved song!