You can bypass this using the dynamic recorders setting fwiw
There’s a gain reduction of 12dB at the inputs so if I was being precious about recording something one off, I too might resort to computer/soundcard … but following the above link i’d also offered up a blind test between a pro source recording , an OT capture and a capture into a hand recorder through the headphone outs … the forum responses were pretty mixed as to what was what, it was extremely subtle in terms of variation to be fair and from my perspective it took a bit of critical listening to distinguish source from others, certainly nothing there to dissuade me from recording direct to OT, particularly when that is where you’re using the captured audio
offering the OT a signal of the type it’s expecting is really all there is to it, it’s not expecting a guitar signal so best not to