No play back on multiple audio tracks

I am editing a project and can not get all of my audio tracks to play back. A3, A4, A5, A6, ... all are silent. In audio editing, on the mixer, tracks show they are being played on the faders but no sound. A1 and A2 play just fine. Any suggestions? Thank you in advance.
mmm

Let me give you a stronger clue, mmm. If your timeline audio playback is set for more audio channels than you have available in hardware, A3A6 could be set to output to channels that don't exist. Make sense?
Right-click (Control-click) on the Audible button for each audio track and slide your mouse over to Audio Output to see what's what.

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