The following are possible reasons why there is no audio input or poor quality audio input from your recording device:

Channel settings

Input device might have a problem with certain channel settings. Try changing channel settings in WavePad (e.g. use Stereo instead of Mono). To change channel settings, tap here.

Wrong device selected

A different recording device may have been selected in WavePad options. To check this, open WavePad recording options by: