well, the settings should probably be -10 on the output of the delta 66, and "line" or -10 on the input of the pod. is that what you are doing.
by the way, it is most likely not your cables (if they work for other things, they should work for this task).
do you have a mixer? that would help quite a bit.
reamping is always a bit of a chore, cause amps (in your case a pod, why not an amp?) and recording devices dont match up well level wise. which is why you can buy little reamp boxes which will match them up for you. they are very expensive... you probably dont want to lay out the cash for them.
the poor man's trick is to use a DI box in reverse. you make sure the output of your recorder is balanced +4, and send that to the output of a DI box. then connect the input of the DI box to the input of the amp (pod for you).
this works pretty well in lots of situations, but for some reason, it fails occasionally...
you can pick up a DI box for less than $30. or you can make one, plans on
http://www.jensen-transformers.com/.