While I'm still anxious to use the Bubble Chamber when it is completed, I'm really enjoying my tricked out Xero. I've had some feedback for Taylor but haven't really shared my thoughts here.
I will say this. In terms of what the standard production model was designed to do (static low pass filter for dub like tones or synthy combos using an expression pedal to sweep the cutoff frequency) it is incredible. A flawless execution in my mind.
It's nice that the Moog labels the Frequency knob (though either through being an approximation or just parallax it never seems exactly right to me), but that's a minor quibble. In fact, the biggest criticism I could give Taylor is that the super bright LED and the faint knob lines make it hard to see exactly where you are in the knobs range.
But honestly, other than that it does EXACTLY what it is supposed to and does it well. Small, true bypass, standard 9V powered and great sounding.
As an envelope filter, it is also very good. Though the Chunk is a 2 pole only LPF, the tonal similarities between the Xero and the 00Funk are very strong, both in the basic character (modern and synthy) and the range of settings. The Chunk is a bit more tweakable but it's also harder to dial in than the Xero. Both also sound great with dirt and are perfect for the classic octaver/fuzz/filter combo.
Taylor and I have talked about the down sweep (which absolutely clamps down and doesn't let sound pass through) and it is one feature of the Xero that I currently don't use. The slow attack is also a bit laggy for my tastes.
That said, I'm stoked with this little box. It actually exceeded my expectations and that doesn't happen often with pedals. And it looks great too.