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I have an MRA-F350 decoder/amp, which needs a KCE-900E between the Nav and the Head to correctly route the audio. Without it, you'll only hear directions when you're specifically tuned to the Nav input.
I looked at the manual for your processor, and it looks like it needs the same thing (pg 42 in PDF on Alpine's site)
Nav > KCE-900E > Head (RGB)
KCE-900E > Processor (RCA + Guide Control)