Jlien X
Every time a project is opened for the first time after Sonar is launched, Sonar transmits a control map specifically designed to be used with Sonar (called "SONAR ACT MAP 2") to the A-Pro hardware to overwrite map #19 (this doesn't happen if you haven't added A-Pro to Preferences > MIDI > Control Surfaces). This is why you see the ACT button automatically turns on and see "Receiving..." on the LCD.
Thanks for the reply,
JlienX - But none of that happens for me. The ACT button has
never turned on automatically, and there's no "Receiving" display on the LCD. But the keyboard's controls are engaged, with the faders hooked up and controlling the track faders in Sonar, for instance.
Often, but not always, I'll start to work, and the keyboard isn't controlling Sonar - because in Preferences, the A-Pro has been dumped as my surface, and I have to set it up again, save Preferences - and it'll stay there for awhile, then mysteriously just disappear again on another day.
Randy B.