I spent some time yesterday trying out the ToneX One as purely an audio interface to other things, and it performed very well. To do this you have to switch Direct Monitoring off (in Librarian settings) and have it bypassed in Stomp mode.
Connecting it direct to a new iPad Air was good, no problem getting power over USB-C. There's something about the sample rate that affects its compatibility with some iPad apps, which I've seen a few complaints about - I think it's because it's 44.1 kHz rather than 48 kHz, or something. I couldn't get it to work with Korg Gadget 3 or the Aurora Mammoth standalone app, but Mammoth and others worked fine as plug-ins hosted by AUM. Logic Pro was great too, as was IK's ToneX app that uses the same models.
I also tried it connected directly to my Mac Mini, also over USB-C, using ToneX (of course), Apple MainStage and Logic Pro, and even Neural Amp Modeler - no issues there. There's no problem using the pedal's own processing when recording to DAW, but you don't need to when you have ToneX as a plugin in the DAW.