thanks for listing everything.
the digirig radio to digirig cable has only 1 audio output, 1 audio input, 1 Ground, the remaining contact is for PTT, not the ‘missing’ channel of stereo audio.
i’m sorry i’m flying blind since i’m unfamiliar with the video in question as well as anything apple related
was mike, hamradiotube, using a digirig cable or simply a trrs to trrs cable?
i’m glad it works with the digirig soundcard+ptt device inline.
good luck
kb0wlf