That's a first. Never heard it experienced any lack of low end. If anything there is too much low end.I play in a loud rock band with one heavy distorted, noisy guitar and a hard hitting drummer. I found the low end dropped significantly during the 2-3 songs I used it on and then noticed a fuller sound on the songs without it. Maybe I could tweak it more and try to find a sound that works, but I just gave up on it after a month. Our guitarist really likes it, though.
I went back to my trusty DOD Bass Overdrive for the time being for some extra bite.