Protection of audio inputs?

The schematic of the patch shows 2 op amps that connect an input signal to the DAC on the daisy. Used in a eurorack environment the input voltage on the patch could be -5 to 5 Volts or even higher.
I had expected there to be some kind of input voltage protection following the op amps. Such as e.g. 2 zener diodes that protect it for anything higher than 3.3 V or lower than -3.3 Volts. The schematic does not show a protection like this. Is this not necessary or maybe there is some protection in the DAC itself?

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