Sound volume is too low or too high. The sound volume can usually be set using the volume control device on the card's cover shield. Sometimes, however, it requires a software setting - see your sound card manual. Sound is distorted. There are many possible causes, e.g. low quality of loudspeakers.
Some sound cards allow for the setting of both the volume and tone.
Consult the optimum setting method in your sound card manual. Sound recorded using a microphone cannot be played. If there is a switch on the microphone, make sure that it was on during the recording. Now you can start speaking into the microphone. Hold the left mouse button pressed for the whole time of recording.