Windows 7 + No Audio
This applies to Windows 7 and above and MXWendler version 4.2 and above
Problem
When there is no audio in or out, it is generally related to a non-existing audio recording device under windows 7.
Test
1. Is there a default audio recording device?
2. If not, create a default recording device
Solution
1. Open audio settings, recording devices
2. Right click 'Show disabled devices'
3. 'Enable' the device 'Stereo Mix'
4. 'Set as default' the device 'Stereo Mix'