BMW "Business CD" hidden control functions

[bheiser]

Hello -

A while back I stumbled across a web page somewhere that had information about some "hidden control functions" on the BMW "business CD" radio/head-unit. If anyone knows where this information may
be found I'd appreciate it.

For example I understand there's a way to control the amount of
adjustment the unit makes in the speed-sensitive volume.

Thanks much,
-Bill Heiser