This is the first thing my guitar signal goes into. I bought this buffer to use as a splitter. One output goes into my tuner, which rests on top of the buffer, and the other goes to the rest of board. This way, I can simply lower my volume pedal all the way down to tune silently. No more having to go tuner out. In my opinion, you can tune more accurately when you're just tuning the pure guitar signal itself, rather than having to tune your guitar signal effected by a bunch of dirt pedals.