Hi Venerina,
The microphone permission can be re-enabled like this:
- Open the Settings app from the home screen
- Tap Privacy (you may need to scroll down a bit in the list on the left)
- Tap Microphone
- Find Music Studio and enable the switch
- You may need to quit Music Studio from the multitask switcher and restart it for the change to take effect, but I’m not sure if this is necessary.
Hope that helps!