I think other zoom pedals have this too. I understand some of you have used this mentioning the HPF feature of the AsBsPre(Depth), which is supposed to be a simulation of the Fishman preamp. Are you getting good results? I've noticed some difference with it, but need to spend more time tweaking it before a show. I'm sure it's not as good as some stand alone units such as the Broughton. The D15 is another preamp that has what seems to be a LPF, a hi cut, functions. Has anyone done anything with that?