Saul wrote: Not sure if this is right but I don't think the Kronos has the audio interface? I know the Krome didn't which is part of the reason I didn't buy one.
Yes you can send stereo audio and MIDI over USB on the Kronos - just started making use of that as my natural instinct is to record what is coming through my line mixers!
Also do USB recording from my line 6 gear as you can get the dry as well as processed guitar signal, which is great for re-amping. My new Helix pedal is great for that, as it is the first one I have seen where you can send the recorded dry signal back into the pedal for re-amping in the pedal. Never have I had the problems you describe.
Yamaha can be funny when it comes to admitting design flaws (if it is one). When I was reporting EX5 SYSEX MIDI bugs to Yamaha UK, Yamaha Japan denied there even being a MIDI SYSEX implementation in the EX5! Which is patent nonsense as ex.factory is using it (with workarounds).