If you want to add peddles between your guitar and your amp you have to use a odd pattern for 3 peddles. From the guitar to the amp; 1st peddle, guitar uses IN, the Out goes to IN on the 2nd peddle Out to Out in the 3rd peddle, the IN plugs into the amp. At least that is how it was done back in the 70's. That is not a typo on how to hook peddle 2 and 3 together.