Then be sure that when you select the particular source, the Yamaha says "AUTO" after a few seconds. That means that if only analog audio is there, it will select it. If analog and digital are there, it will select digital.

If you accidentally hit the input button more than once, you will change the audio mode. If, then, for instance, you change the audio mode to DTS, you will get no audio never nohow until you put in a DTS disk and select DTS on the DVD player. If you leave the input at AUTO, it will give you sound no matter what type of input you send it.

This is selected input by input and the receiver remembers how each input was last set.

That's pretty important, that thing about not hitting the input button more than once. I have seen macros where there were more than one hit and the purpose was to be sure the input was selected but the result was that the audio mode was messed up. And differently every time!