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I've only ever seen this on an official SXM radio, never on any OEM's integrated thing, and not even on the various 3rd party aftermarket radios (I've seen SXM on both Alpine and Pioneer units and neither one had the "preview" you're talking about).
I know what you mean, because I think I have seen it on official units and it is pretty handy... but I'd be surprised if it's in idrive.
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2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
I'm an IT guy by trade and tech nerd by choice. 
I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway.
I'm also a fan of aural pleasure.  |