How can I get output clearly

I have recorded in Audacity through my laptop connected with mixer is not clear. Once I record it was clearly recording.
The recorded output was not clear after I play. Is there facilities in Audacity to increase sound and things to listen clearly?

Does it sound bubbly or fade out?

If your problem is very loud sound with crunchy distortion, it’s possible you plugged the mixer into the Mic-In of your laptop. Many laptops do not have Stereo Line-In. Mic-In is mono and overloads very easily.

We recommend the UCA202 as one good way to add stereo recording to your laptop.