The FX tab appears once a Vocal effect has been purchased using In-App purchases. To purchase C1:
- Tap the info icon at the top right of the main screen.
- Select Buy FX.
- When you are ready to purchase, tap "Buy Now".
- You will be shown the price and asked to confirm your purchase.
- 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.