From what I’ve heard regarding their Mel9 and Synth9 models their tracking is great, I think the Mono Synth uses similar digital technology.
I used to have an Electro-Harmonix Bass Micro Synth, an analog pedal. It sounded really great, very organic and great low end.
More recently I had the Meris Enzo, perfect tracking, and a good delay which could be used standalone, but it didn’t have the character of the Micro Synth.
From what I can gather the Micro Synth is distorting and filtering the original signal, so no issues with tracking, and may be replicable with modular.
I do enjoy Rings with guitar, using an Ears as a preamp along with it’s envelope follower or the gate to another envelope, another fun thing is using the gate to advance a sequence one step at a time as an accompaniment.