Hi all, I'm looking for a chorus pedal, and want to keep it simple and under $100. I'm looking at the T-Rex Bass Sweeper and the MXR M148, which was reviewed here. I like MXR stuff-- I have a number of their pedals, some of which are lifelong favorites. I've never tried the T-Rex, but I've seen some good reviews. The MXR has only a rate knob, the T-rex has rate, depth, and volume..... How much difference in your experience does a depth knob make?