I tried to put my JM4 at the end of my guitar signal. So I could send my effects to the JM4, Not using the on board ones. For some reason it didn't give me any sound through the JM4 to record. I couldn't figure out why and gave up. Is there a way of doing this? I need to record a rythym track using different reverb effects that I want to loop. Without using any on board effects or sounds. Anyyone's help with this would be appreciated.