Audacity

Audacity is free, open source, cross-platform software for recording and editing sounds.

http://audacity.sourceforge.net/

Remove Noise

According to http://wiki.audacityteam.org/wiki/Noise_Removal#Noise_Removal_steps

1. Select a part of the recording where there is the noise you want to remove
   1. Go in the menu "Effect -> Noise Removal" and click and click "Get Profile".
2. Select your whole recording (Ctrl+A)
   1. Go again in the menu "Effect -> Noise Removal" and click "OK".

Remove Mouth Noises

First recommendation:

• Select the mouth noise and remove with as described above in Remove Noise

Second recommendation:

• Select the mouth noise and
  • Go to "Effect -> Amplify", set Amplification to "-50.0" and click "OK".