I've been trying to figure this out for hours, and my head is totally done in at this point.

I'm trying to record using 2 stereo inputs. One pair to the mic jacks, the other to the inst jacks on the front panel. Up to now I've only used one or the other not both. And had no major issues. Recording on either Durec, or direct to my iPhone. I've test both and failed both.

(I use the iPhone to 'quickly' film works in progress, and haven't had a problem with just one pair of inputs.)

The mic jack inputs record as usual. The inst inputs show signal, and I've selected them to record, but nothing is happening. I've read through the manual as best I can, and found nothing.

As far a I can tell all settings are identical between the two pairs. But there's a lot that's not obvious so I'm surely missing something.

I've tried both using Total Mix and direct from the panel, no difference there either.

Follow up question, and forgive me, as I'm at the end of my wits right now, how do I get playback to work? I had it working and then lost it. Playback initiates but no audio.

One final piece of info, I'm monitoring through headphones, and have no other speakers connected to the system. I hear everything normally in the headphones, but obviously the Inst signal is getting to where ever it needs to be for recording.