This small box works miracles. All guitarists have cases where they hear the sound of their guitar being lost. This occurs most often when using a series of effects pedals. You can hear that signal strength has dropped and high frequencies are lost. You'll hear the difference if you plug your guitar directly into your amplifier, or put a pedalboard in between (even with only a few pedals).
The Shaman is designed to make up for this loss of sound without changing the color or adding noise.