XFCE4 - Multiple mixer plugins

So I normally have 3 mixers on my panel in xfce4 as I have lots of inputs I control independently. Normally this can't be done as it won't allow you to add more than one mixer.

This is easily solved however:

File: /usr/share/xfce4/panel/plugins/mixer.desktop

[Xfce Panel]
Type=X-XFCE-PanelPlugin
Name=Audio Mixer
Comment=Adjust volume levels
Icon=multimedia-volume-control
X-XFCE-Internal=false
X-XFCE-Module=mixer
X-XFCE-Unique=false

The change of X-XFCE-Unique=true to false is what it takes to allow you to add more than one plugin.