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I must be blind. I can not find the button to change groups on the stereo. I have searched and still have found nothing. Nothing in the cars manuals ether.
It IS pretty lame that none of the instruction manuals mention this anywhere. (On the plus side, that means "RTFM" is not an appropriate response to this question.)
This is a benefit of being an Acurazine member. Where else would you find this secret revealed? Having the answer in the manual would spoil the fun. I wonder who figured it out first?