I'm thnikng about replacing my phaser (Maxon PT999) and tremolo (T-rex Tremster) with a Line6 MM4. I'm mostly interested in the tremolo and vibrato effects rather than chorus and phasers, how do you feel that these work for bass? Can they be set "slow enough"? Especially most vibratos I've heard are mostly "fast to very fast", but I'm looking for something to go "woooooo-uuuuuuu-oooooo-uuuuuu" at a very slow rate I've read that most people are happy with the way it treats the bass freq's, so that should be alright. How about volume drop? Is there a level-control on any of the settings? And just to set my mind at ease - you're limited to one preset at a time, right?