Are those inputs balanced or unbalanced ?

ELECTRICAL CHARACTERISTICS

Mixer section

Line B input (1/4 phone jack x 10)
Input Impedance........20k ohms
Nominal Input Level........ -10 dBV (0.3 V)
Maximum Input Level....... +12 dBV (4.0 V)

And how can you tell ?

Thanks !

Unbalanced

1/4" "phone" inputs...-10 dBv.

Phono/phone usually indicates a TS connector when speaking on 1/4" connections. Also, -10 dBv is typically found on consumer/prosumer products and is USUALLY unbalanced. As with anything, there are exceptions to this rule.