What does the manual say about it?

"tracks 4 and 6 (the piano and bass)."
Irrelevant, but that's the tracks I use on our Church mixer for the same instruments!
Organ/EPiano on 4, Bass on 6 if anyone plays it.

Jules

Curious button pushing Church sound guy...I use track 5 just for tamborine. You? lol

I still need help though.

Julie

Tambourine, along with drums, infects 2 and 7 thru 10 which are the mics. It's a live setup so tambourine is just there, annoying me, instead of serving some discreet purpose.

If 15/16 are fine, are they definitely ALL that's being put to the CD or is there any chance the other tracks are being added in somehow?
Check the manual (if you have it - you should be able to find it online) about bouncing, monitoring and making CDs.
Although if you bounce 1 thru 10 to 15/16, and then solo 15/16 it would make sense that all you hear is the bounced-down mix.
Maybe when you run off a CD, it adds in all the rest of the tracks again, but 4 and 6 are configured differently and don't get added?

Page 79 of the manual:

"Before executing actual track bouncing, we recommend you to rehearse the bouncing operation repeatedly until you are satisfied with the setting of the level and balance of each playback track, as well as delay/reverb setting for tracks 1 through 8"

Have you rehearsed it sufficiently to reduce these issues?

You are so nice to even attempt to help me.
I may have trouble answering your questions, as I don't really know what's going on even after reading the manual. Your questions are flying over my head (as is the manual), so I realize I might not be able to be helped...but thanks just the same.

I rehearsed and carefully noted how I wanted to mix to 15/16, so I think I got that part.

I listened to 15/16 with it set it 0. It sounds like I want it to. I mean the piano and bass are loud. Recorded to a cd? They're buried again. I don't know. Maybe all tracks are somehow reaching the

I listen to 15/16 and look at the bars that go up and down...they have nothing to do with the levels I'm hearing. It's so insane.

My guess is that when you think you are listening to just tracks 15 and 16 you actually have other tracks in there as well, or you are not listening to 15/16.

Try a test recording. Unplug your instruments and connect a CD player to a couple of the inputs, 1 & 2, say (not 15,16). Play a CD that has recognizable L-R panning and record it on the MR-16. Replay 1&2 and check that it sounds like the original CD. Bounce that down to 15,16. Replay 15,16 and check that it sounds OK. Record silence over tracks 1,2. Repeat the listening on 15,16 and check that it is still there and sounds OK.

If all that works, repeat the bounce on the original band tracks.