Most pedal manufacturers employ pre-packaged ICs (integrated circuit chips) to buffer their signals. These class-B chips are designed to be extremely efficient, quiet, and very compact making them perfect for electronics that employ batteries that would otherwise quickly run dead. These chips are also really cheap! This reduces manufacturing costs and best of all, because they are really easy to use and come with great application manuals from the same guys that make cell phones, anyone with basic electronic knowledge can use them.
Only one problem. . . they sound bad.
Why? Well--guitars are not buffered sources like iPod. Guitars are musical instruments. They breathe and spit and bark and cry. They are alive. As soon as you connect a pre-packaged frozen dinner in between the pickup and the amp, the instrument becomes detached. It just is not the same. It is the way that the guitar reacts to the circuit that completes the instrument.
For a buffer to work, you have to treat the guitar as if it is seeing the world's best guitar amplifier. The LS 'Tone Messiah' does just that. It uses a unique class A circuit that has been optimized for guitar.