I thought I was the only one who couldn't get a useful live sound out of the X/D! It sounded like the gates of heaven at bedroom volume, but at gig volume, I couldn't get anything useful. Any small tweaks would cause ginormous changes in what the pedal was doing. I'm using the MXR and it's ok. I tried the Aguilar, and it wasn't bad, but it was the end all. My favorite filter-type pedals have been the 105Q or Strymon Mobius, but the 105Q is a wah pedal and the Mobius needs to be programmed. I'm probably still going to go back to one of those...
I think the X/D probably fails from having too much in the way of extremes in parameters, because it can adjust so very low to extreme high, and the resonance does the same (I find it turns into a feedback/self-oscillating mess up past about 1 o'clock. That that means is you have to be really careful with adjusting and those tiny fractions of a degree mean a whole lot. If you're getting away with one or two settings, then that's workable. Just mark your places and make sure you're hitting those marks.
The Divaricator fixed a chunk of this for me, and I have that marked as well. I do find that coming to a place where the effect is audible to me (and in the FOH) but not reading as 'too loud' is where I now futz with it on stage. Over the weekend we were on the road and the 'house provided' setup was traditional 8/10 Ampeg cabs. One night with a DG Microtube head (which I used) and the other with my own Jule setup. I had a REALLY hard time hearing effects through those 810's, and anything above low mid in general. Had my bass mid & 'high' control way less rolled than usual and then still couldn't hear the damn upper sweep of the filter.
Spending sometime dialing in the expression on the X/D is crucial, the top end of it rides out of 'audible' and good sounding if you're not careful and the low gets in the sub-zone and can really swamp your tone and potentially kill speakers or clip your amp (with my old Peavey IPR it would literally trigger the amp to shut down especially in the 'down filter' mode).
Feeding it is another matter. I spent a few hours the other night playing with just the Frazz's EQ, Vol. & Voltage settings and you can really get very very different vibes out of the X/D just with very small changes of what you're feeding it. I've sort of started to think of the Frazz as part of the X/D's control set. So yeah, lots of time in to get places you want to go, and still working but I like a challenge.
I'll spend some time playing with the Cali76B and let you all know what I find for clean envelope.
In the meantime, back to Dingwall content.
Everyone in my band, especially the tone tweaks are LOVING the NG-3 and are really happy with what we're hearing. It sounds tighter and faster and more coherent in the mids. I've moved to the 'traditional' series bridge/middle setup and have been finding that it's working great in our context. I still have plenty of low yet excellent definition on top of that.