DT "Without DL" preset

Hi all! I’m a newbie to the Digitone, been fiddling around with presets for a while and very happy with this. I recently hooked up a 61-key midikeyboard and discovered then that the “Without DL” presets start at C5, playing all notes below C5 the same (C5). I can’t find this behavior in any other presets. Wondering if it is possible to extend the range further down the octaves? Changing the C parameter down 8 makes the sound darker like a sub-oscillator, but I really wonder where to set the midi-range in the preset?