64 or 32 bit mixer

[Schimanski]

The coming weekend I have two live recording sessions.I use iPad4,64GB,Focusrite 18i6 and of course Auria latest version.
The setup is : 3 mics and a stereo synth into the FOH mixer.I take the direct outs of this mixer and plug them into the 18i6 line
Ins.And I use 2 mics into the mic ins of the 18i6 for ambience.I have to record 2x 60 min sets.
So I did a test recording with everything hooked up - everything worked fine,I even recorded two projects with 70 min,just to
be safe.No problems.
My settings are:backgr.audio off,aux delay comp.off,latency buffer 500, effects while recording off,rec.monitoring on.
Long story...Now here my questions:
I used the 64bit mixer.Does this affect the recording quality or does this only affect the monitoring quality?
When I switched to 32 bit,I had the strange impression that the audio was kind of "compressed".Very strange!
My second question: would it be preferable to use the highest latency buffer (safety) as nobody has to sync during
this recording?
Btw,the 18i6 works great!Plug in and start recording...
Thanks for replies!

[Rim]

Your settings look good. The 32/64 bit setting only affects mixing, not recording. All recording is done at 24 bits (the maximum the A/D converters output). There's no need to set the latency any higher if your CPU reading is low.

Rim