Installed iShowU Audio Capture. Created Multi-Oupt Device. Set Output to MultiOutput Device & Input to Focusrite Thunderbolt in system preferences (pref show reading mic input from the claret 8pre with no difficulty. Per instruction assigned Focusrite Thunderbolt ti Mic/Aux Audio and iShowU Capture to Mic/Aux2. Focusrite Monitor Outs 1&2 Assigned to Alnalogue 3-4 in Focusrite Control Panel; show correct input arriving at monitor outs. But No signal on Audio Mixer with both Mic Aux and Mic/Aus2 meters showing and set at 0.odb. Video switching between cameras fine; just no audio