The aircraft will respond to changes in the "selected" airspeed if there is enough power available. Whether the aircraft can achieve the "desired" airspeed is, of course, partly due to the throttle position, however CaptainGlick never stated what his throttle position was, so, one cannot not assume it is strictly a throttle problem. In any event, stating … "You do realize that changing the speed bug has no effect on the IAS speed, right?" … is not correct (as I stated) because the bug absolutely does set the "desired" airspeed when in IAS mode. I wanted to make sure users of the Saab were clear on this, that is all.