Question There is no FX tab on the left side of the main screen. How do I get it to appear

The FX tab appears once a Vocal effect has been purchased using In-App purchases.  To purchase C1:
  1. Tap the info icon at the top right of the main screen. 
  2. Select Buy FX. 
  3. When you are ready to purchase, tap "Buy Now".  
  4. You will be shown the price and asked to confirm your purchase.
  5. If you complete the purchase, when you go back to the main screen you will see the FX tab and will be able to use the C1 effect.