I am a newbie... I have a Roland a-500s, and trying to use Sonar LE. I DID have it up and running just fine. But then I used other programs for my job. (several!) Now, when I go back to Sonar LE, I cannot get sound coming out of my computer using the A-500s and Sonar LE. I DO get a midi file playing just fine out of Sonar LE. What am I missing?

Please don't do this. Spreading the same question on several forums only leads to a mess and people don't bother to answer you.