Might it be possible via a firmware update to allow the expression pedal to control the overdub level while in Looper mode? I believe the default overdub level is fixed at around 95% or something like that. It would be a really nice addition for those into more ambient or delay based looping to be able to adjust the overdub level on the fly. This is possible on more recent Line 6 devices, and on the older M-series units. Since there is no physical control for that parameter in DL4 mk II, I suppose it would have to simply default to whatever the min/max-heel/toe expression values are. There really wouldn't be a way to choose a specific heel/toe value. But perhaps there could be an additional option to invert the min-max, heel-toe position. I imagine this would offer a deeper level of looping for some, and make the mk II a contender for those who seek that kind of functionality in a looper.