I ran the F6 at a piano recital again today, this time 32 bit float only, no 24 bit fixed backup, two stereo tracks. I had the Track Knob set to Rec Level, so the input "trim" was controlled, I guess, by the knobs. I cut the L/R mix levels by -3 dB in the Rec > LR Track > LR Fader menu, so that the L/R tracks came out matching the ISO stereo take.
1) I set the "trim" at +13 dB, a little below where I set the menu trim last week with dual recording (Liszt Transcendental Etudes are pretty loud). In spite of the screen showing no red that I noticed, the recording, viewed in Audacity, Wavelab 6, and Rx7, looked clipped, and had to be reduced 7-8 dB to get a clean track. That worked fine, but Wavelab had problems with it. First it showed that I was about 640 dB over, clearly wrong since the clipping was nowhere near that awful. Rx7 got the peak levels correct, and Wavelab let me cut by -8 dB, but when I tried to save the corrected file it saved something with a good L track but a clipped R. Copying the file to a new track instead of trying to save it directly fixed that, I would guess newer version of Wavelab might handle 32 bit better.
2) Sounds good. Next week I have a piano and wind sextet, will do 4-5 tracks and see if 32 bit helps with instrumentalists who can move and maybe get too close to the mics.
Jeff