I do not know what the Lambda feature is, I do know that the Denon 1560 is 15 years old now and possibly that was a feature that is no longer supported.
I looked at Denon's international web site and this model is no longer listed, even among the discontinued models. I say if you like it, play it and not worry about what they had planned for it.
I looked at Denon's international web site and this model is no longer listed, even among the discontinued models. I say if you like it, play it and not worry about what they had planned for it.