I'm trying to set up a Logic project I can use as an external VI slave. I have project in DP that needs to access samples that will only play in EXS 24. I'm using IAC and Soundflower to send MIDI from DP to Logic, and to return audio from Logic to DP. There are five tracks in Logic, each with an instance of EXS 24 and a different sound in each. The MIDI channels in the Inspector are set 1 to 5. Outputs are set to the first 5 pairs on Soundflower. In DP, it is sending MIDI on channels 1 to 5 (I checked this with MIDI Monitor), and hearing audio on 5 stereo aux channels in Soundflower. Generally, this works, but: The problem is that Logic is listening to all the MIDI channels on all the tracks, meaning that the audio going back to each of the 5 aux channels in DP has the sound from all 5 DP outputs. How do I get Logic tracks, channels, etc, to listen only on one MIDI channel? Is there a mysterious Environment setup I need? Or is this something I should be setting up in MainStage?