If your sound card supports the Windows mixer, skip this section since the WinMLS mixer controls the volume. If you cannot get WinMLS to control the volume properly, you can use this method.
The Windows mixer may be found in the Multimedia folder in Accessories, and also in the Control Panel. Some sound cards only support their own volume control that is found in the specific sound card folder. A typical volume control is shown in the figure below.
The volume control figure above shows the output volume. In WinMLS, only the Wave Output shown in the figure above is used. It is a good idea to mute the other volume controls as shown, but do not mute neither the Wave Output nor the master Volume Control.
We also need to adjust the input volume. In the menu shown above, go to Options->Properties… and Adjust volume for recording. Then the following window is displayed:
Select the input you would like to use, either line-in or microphone. While you use WinMLS, you probably need to set both the input and output level. It is therefore a good idea to have both the recording and playback controls open at the same time. To do this, just open a new volume control in addition to the one already open.