That is a hint

I think your speakers might have CD Source mapped oddly.

One experiment you could try is, while playing the CD try moving the input on your main speakers from D1 to D2. If that works they are TYPED wrong or manually mapped wrong. Could be only CD is mapped wrong which why everything works.

You could be TYPE 5 and some sources will be on D1 and some on D2.

And/Or try retyping them to Type 6. That Puts all Sources on D1.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
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