Sometimes the song you export may be too quiet or loud and there are 3 ways to increase or decrease the volume of your tracks within the studio:
1) Adjust the volume mix for each track. In the studio, select the Mix button at the bottom and then adjust the toggles. Learn more about mixing here.
2) Adjust the gain within vocal effects (Gold Subscribers). If you tap on the settings in any of the vocal effects, you can change the gain up or down and listen to the difference. You can also save custom effects for future tracks. Learn more about customizing vocal effects here.
3) Apply Mastering (Gold Subscribers). Mastering will boost the volume in different ways and you can apply this after a song is exported as well in the song settings. Learn more about mastering here.