Ok tried the Gigrig wetter box as an option for analog dry through in my X88ir loop.
It's going back.
In is clearly designed for blending stomp boxes in parallel and has the FX loop capability as an afterthought.
I don't like the sound of the buffer in the dry side when turned on. I don't know but even when in true bypass operation this only applies to the overall bypass and still puts the buffer on when you turn on the pedal (causing a change in the dry side signal in operation ? Sounds like it to me anyway). Also the sweep of the mix control is not very useful blending to the dry signal (great to blend A+B but not B and dry). You also have to leave the A side empty to actually do this you can't make use of the connections (and a switch) to avoid the need of Y leads for stereo operation even though the pedal has a mono in stereo out set of mono jacks.
The configuration of the pedal is also all about putting it on a pedalboard and blending FX boxes not putting it in the back of a rack system.
You really wouldn't think a box that had mono send stereo return (three jacks) unitary gain ( to the FX loop ) and a mixable loop also stereo/mono send stereo return ( four jacks ) was that difficult to do.
The truth is if I put an analog dry though pedal in the series loop it sounds different to the same unit set kill dry through the Wetter box, and by different I mean worse. So for the £249 I am just getting a different shade of different to the overall sound compared to just putting the Axe in series. Neither manage the dry to sound and feel the same as the actual dry.
Years ago I used a Peavey (yes not a typo) Valvex rack mount tube mixer and it was totally transparent. It could do this perfectly but this had multiple channels and only switchable by manually pressing buttons on the front panel is 1u and total overkill for this application (and long discontinued).
The Lehle Parallel 2 may actually be the only compact solution of sufficient quality but this is still F###ing Y leads to do stereo.
A friend of mine uses a PSplit and two mini mix 2s for his rack but there is no loop at all on his preamp. This seems to be transparent but all mixing is on the units themselves and costs about £700.