On the DR-22 you see, on the display, 0-90 for level (arbitrary values but constant) together with a dB number relative to where you started. So if you are peaking regularly to -18dB and you'd rather be going to -12, you turn the rotary encoder until the display shows +6dB (relative to where you were). Seems like a good system and one they could probably implement on the DR-70 in firmware upgrade.