When I record a rap, the center of the waveform is not aligned with the zero line. What can I do?

The problem of the waveform not being centered on the zero line in a rap recording is a phenomenon known as DC offset. There are a few methods you can try to correct DC offset.

1. Use audio editing software : Many audio editing software have a feature to correct DC offset. For example, Audacity is a free audio editing software that has a “Correct DC Offset” feature in the “Effects” menu that can be used to align the waveform to the zero line.
2. Check your hardware connections : A DC offset can be caused by a loose connection or faulty cable on your recording equipment. Check all connections and replace cables if necessary.
3. Adjust the recording level : If the recording level is too high, it may not only clip the waveform but also introduce a DC offset. Adjust the recording level to keep it appropriate and ensure that peak levels do not exceed 0dB.
4. Use high-quality recording equipment : Low-quality recording equipment is more likely to cause DC offset problems, so if possible, record using a high-quality microphone and interface.
5. Update your firmware or software : If your recording equipment or editing software is out of date, updating it may resolve the issue.