I recently got this unit along with XM radio and really like it. I've got
the controls mostly figured out, but there are errors in the manual.
Specifically, when the XM tuner is active there's an option to step through
the channels either one at a time or by category, but I can't figure out how
to use it. The manual says the toggle is the clock button, but that does
nothing. The function button switches the display between "channel" and
"category", but it's not clear how to lock either mode. Does anyone know
how to make this work?