Thanks, I had seen that in the past. I watched it again. It did seem to answer the question about not ticking the master check box because there already was an audio file present which would act as the master.

What wasn't clear is my first question about the destination for the stems. The video's example seems to keep the "audio" designation selected and not the drop down option of utility #1 as the first split location. I found this slightly confusing since there already is an audio track present (the master). So I guess this one question still remains for me.

I appreciate your pointing this video out again!