My TimeFactor is on my guitar rig pedal board and will be connected in series with other pedals and go out to two amplifiers (for stereo effects). I need to buy an expression pedal but need some input from users. The Boss FV-500L is one that is recommended by Eventide, but some reviews on Harmony Central say that the FV-500L sucks tone on the TimeFactor, and the reviewers recommend using the Boss FV-500H (high impedance) pedal instead. Any thoughts? Should I get a differnet pedal instead? Thanks!