Use current brush to mix colors
Clear mixer
Choose mixer background
Enable auto-picker
The first 3 brushes of the 3rd category – is the brushes of the Mixer:
You can setup this brushes how you need.
To erase paint at the mixer panel – rollover cursor to the mixer and press eraser hotkey (E)
To undo at the mixer – rollover cursor to the mixer and press undo hotkey (Ctrl+Z)
To restore default mixer image: Open Paintstorm Documents directory: “Documents/Paintstorm studio/Data/” find and delete the mixer.png file, restart Paintstorm.