Audio recorder
Stereo Mix
Audio recorder works only on Windows with Stereo Mix correctly set up.
Stereo Mix is a virtual device that will let you record sound from the output of your sound card.
Right click on the volume icon in the tray and open Recording devices.
If you cant see Stereo Mix there click in the background and select Show Disabled Devices. Enable Stereo Mix.
If you still cant see Stereo Mix you have to download the driver for it:
http://www.realtek.com.tw/downloads
Accept the terms and download the 32/64 bit version. Install it then restart your computer when finished.
Recording audio
Audio recorder works together with the video recorder (Recorder menu) but audio and video output is separated in files (.wav for audio and .avi for video).
Audio recorder is turned off by default. You can turn it on in the settings. (Client - Settings - Recorder - Audio)
Microphone and system audio is recorded separately.
Volume boost can be applied on the audio recordings. Make sure to try this out and find the suitable boost value for yourself as this may differ on any computer.