I'm not going to go to the trouble of putting just the chorus through the send/return as I only use it to add some depth to the sound when the SY-1 is used to emulate an organ doubling the bass. I hadn't considered the difference in levels before asking the question, so I will take on board (no pun intended) what Bill said, and as I am not using rack fx requiring a line level input, I will continue to put the pedals between the bass and the amp input.