I've also had this problem but with the Modfactor. It's not too gib a deal except when I'm using Tremolo, but it drifts out of time pretty quickly. I've tried it with 3 different metronomes (a Tama Rythmwatch, a cheap Korg one and a Matrix.) This is an issue mainly because the band I play with always runs a click. If the song is at 140 BPM, I set the Modfactor to 140 BPM and after 10 seconds or so the tremolo is coming in on the upbeat. Will this be addressed in an update later on?