VolumeMax applet uses Pulseaudio sound server for changing the volume of the system.
Pulseaudio must be installed in order to make the volume changes using this applet.
Unzip the VolumeMax-
For the very first use this value gets set to 100%. Set the maximum to desired value using the "Configuration" (see Screenshots) and reload the applet. The new value will now gets set to maximum
The maximum value for the applet can be changed by changing the 'max' under the 'maxPercentage' parameter in the settings-schema.json file.