I'm having the exact same problem. I have Logic pro 9 and superior drummer 2.0 These are my steps that lead to the problem: 1. I create new instrument track 2. I load Superior drummer with 16 x stereo setting 3. I go to mixer of SD and select outputs, then "Multichannel" 4. I go to Logic's mixer and click on the "+" sign under the solo button on instrument track I created 5. I'm only able to create 1 aux channel, but not any more than that. 6. My problem is: I cannot create multi aux channels that will route all the outputs from SD mixer However whenever I load up the exs24 sampler and choose the multi out version, I am able to create multiple aux channels just fine which is weird. Anyone know why it is doing this with only superior drummer?