Can anybody tell me the correct method to connect the POD Pro rackmount unit with a Ampeg SVT3 head? I tried connecting the "Model Out" from the Pro to the Ampeg's effects return (as per advice here: http://line6.com/supportarchive/thread/37992/) with zero signal, plugging the bass into the bass input of the POD Pro. Next I tried using the effects send from the SVT3 into the "Line Level Input" with the "Model Out" going to the effect's return on the SVT3. This worked, I get a signal, but it is clean no matter what I do? Any ideas?