I have successfully used blackhole to get sound from logic to obs and to stream (no echo). I am using an external interface (kontrol 6). When i use the headphones with obs closed... everything works fine. When i open obs.. the sound loops and creates an echo in the headphones (both computer audio and headphones from interface). Configuration in logic is input device= interface , output is the “aggregated output” which includes blackhole and system output. Input for obs is blackhole only. Can anyone offer suggestions how to eliminate echo/loop from headphones?