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Great questions!
Channel 5/6 is one channel with a dual input to support a stereo input that is added to the stereo master output buss.
You can connect a single iPad with a split cable.
Channel 5/6 cannot be reassigned to another channel. However, if you just need mono from the iPad, you can set the iPad output to mono and connect to any of the other channels.
You can route USB from PC to Aux In or Master. (corrected)
Does that help?
Hi Everybody
I put a split signal (l&r) in 5/6 and I’ve no stereo in headphone . Is it normal ?