I'm wondering if I'm risking some kind of electrical damage while plugging a regular disto pedal (or other kinds of gain pedals) on the guitar input of a multi effect expecting a passive/active guitar.
Thanks in advance
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Page 5 of the manual says that about the "active/passive" switch:
set this to “ACTIVE” (pushed in) if you have an effect pedal connected between your instrument and the G5 or you are directly connecting a guitar with active pickups
Therefore I think it's fine to have an effects pedal in front of it.
In the troubleshooting section it mentions using this switch if "the sound distorts strangely" suggesting that the likely consequence for having it set wrong is a bit of unwanted distortion (i.e. it probably won't break the G5, but may sound a bit bad)
There is no issue with plugging in an effect pedal in front of such multi-effect pedal.
Note however that a digital effect might have a limited input range, so you may end up clipping the multi-effect input if you try to use overdrive pedal to boost the input signal, similarly to how people do in front of real amps. But again, it's unlikely to damage anything.