Well, I am a pretty well rounded amateur FSX pilot and I know my way around the basics such as takeoff, auto pilot, ILS landings, etc. That said, I cannot for the life of me figure out how to engage the MACH hold setting for the CRJ 700 bombardier plane! I click the MACH button, as logic would indicate that would be the button to enable the MACH hold, but all it does is put a little "MACH" message in green on my little speed/alt/heading indicator screen to the lower left in cockpit view. When I try to raise the speed, it raises only in knots and not in MACH. What am I doing wrong? I don't normally fly this plane (I'm used to the Boeings) and can't use the MACH setting. This is a considerable problem for higher altitude flights. Any help would be appreciated.