If you open up the AmplifiFX app, you can select any tone, then go into the Editor. In the Amp/Cab settings, you can select Amp and then go thru the list to select NO AMP. Then select CAB and go thru the list to select NO CAB. I would probably load up a Clean Tone before turning off the Amp and Cab. This would be how I would attempt to Bypass the AmplifiFX.