GarageBand is a music editing application for Macintosh computers that allows you to record your own songs and add effects to each track. You can also import any song that is on your computer into the application so that you can edit different features of the song, such as the bass. Use pre-made effects to enhance or smooth out the bass in your track.
Open the GarageBand application on your computer and click on the "Create New Music Project" option.
Enter a name for your new file in the "Save As" field, then select a location for the file in the "Where" field. Click on the "Create" button.
Remove the default track by clicking on the track and then click on the "Track" option from the top toolbar menu. Click on the "Delete Track" option.
Minimize the GarageBand application and then locate the song you want to edit on your computer. Drag the song into the application and a single track will appear after it's imported.
Click on the "I" icon to bring up the Track Info pane on the right-hand side of the application. Click on the arrow next to the "Details" option.
Select the drop-down menu below the "Effects" section and select the "Bass Amp" option. Choose the type of bass setting you want to add to the song.
Open another drop-down menu in the "Effects" section and select the "Bass Reduction" option if you want to reduce the bass in the track.
Click on the "Bass" option from the top of the Track Info pane. Select one of the bass effect from the list. Press the "Play" button to hear how the bass effect works with the song.