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Mazda3 Sport GT Polymetal over Garnet
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You need to have an HD Radio receiver. Not sure if all BP MZ3s do or not. My GT Premium does. As you scan/seek through the FM band it should go from the prime frequency, to the next subchannel before moving on to the next frequency, much the same way as an ATSC television tuner works (ch2.1, ch2.2, ch2.3 etc.) For example, in the Windsor/Detroit area, we have 101.1-1 (WRIF main broadcast) and 101.1-2 (RIFF2)
 
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