The new-to-me 89Westy (no name yet, although it might become "Box of Rain")
has a Blaupunkt radio, with what I believe is German dials. I cannot figure
it out! Can someone refer me to a source?

There is a "PCI" button, that randomly interrupts the radio and displays
"PCI" on the digital LED.  Also an ARI button? ....

Also cannot change or regulate sound from front to rear speakers.

Thanks.

Louise