Hi! My main goal is to send my synthesized sounds from my MacBook to my External mixer so then I can modulate the synthesized sounds with some of my external effects since I play guitar. How I was thinking about doing this was to use my audio interface's outputs L/R to go into an input on my zed 14 then to have the master out from the mixer to go to the input of the audio interface to finally be connected to my MacBook through USB. I believe I may run into feedback loop issues. Suggestions? TYVM