Are the main outputs balanced or unbalanced? Thanks
The main outputs are unbalanced (mono), while the AUX output is balanced.
EDIT:
Sorry about the confusion—I wrote my response in a rush. The AUX output is also unbalanced, just like the main outputs.
Are you sure? That sounds like a mistake.
The single aux out is almost assuredly unbalanced stereo on TRS. It’s not mono balanced on TRS.
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So are the mains outs balanced or not ? 
Daniel is correct that the mains out are ‘unbalanced’. The mains out are TS type jacks and should be connected using TS type cables. Don’t worry if connecting an unbalanced 1/4" TS cable to a balanced input of a piece of gear. It will work OK.
While the AUX out jack is TRS, it is not ‘balanced’. The tip and ring of the jack carry the left and right signals as a stereo output.
Looking at the Aeros specs I also noticed the Input Impedance is switchable. I assume this is done in a setting for the input as there appears to be no external switch to do this. I wonder how many users are aware of this setting? Easy to overlook in the manual for those that actually read it. It’s default according to the manual is 1MΩ (Instrument Level)
Input Impedance
Switchable between 1MΩ (Instrument) and 50kΩ (Line level)
I would consider Keyboard and similar gear to be ‘Line Level’. 1MΩ (Instrument) would be more typically used when the output of an instrument could be affected by impedance loading of an input which could degrade the signal such as a guitar or bass (passive PU’s).
Main Input Level
Sets the input impedance. Use Line input for Line-level sources and Instrument Level
for Bass, Guitar, Keyboard and other unbalanced instrument level signals.
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Sorry about the confusion—I wrote my response in a rush. The AUX output is also unbalanced, just like the main outputs.
Thank all 