After a good night's sleep, all becomes clear: put a digital delay in the second loop of an LS-1 (or a Divaricator), and then you can dial up a small delay to match the latency of the Zoom.I ran into this problem putting the G5n in the send/return loop of my Iron Ether Divaricator. It's a neat effect when dry tones offset by 2 msec are blended, but I'd not want to use this tone for a whole performance, or anything other than just a momentay effect (cocked wah?). BTW, the Divaricator is a neat pedal WRT its loop selector, which has a crossover freq knob which acts as a HPF to send only those frequencies to the effect(s) in the loop insert. The LPF portion passes through uneffected, and you have return level knobs for both the high (fx return) and low (dry) signals. It works great for retaining low end consistency while special effects are engaged, especially envelopes and OD/Distortion fx.
Problem solved!