I'm not sure what you mean by lagging and tracking with an envelope filter. You have to play a filter, if it's not closing fast enough between notes for your purposes then you need to tweak it or get a more tweak-able model. I haven't had any problems with the B3's filters keeping up with me. Similarly, you have to play to a synth or octave pedal or anything that "tracks". The Zb3 tracks as well as anything I've used-it's not magic, it has to convert your signal into something else and you have to make sure your giving it a clear signal.
