I wish for an added depth/resonance control for the amps that were designed with one. These controls on an amp, much like the presence control, have a tonal effect on a lot of amps, in a lot of amps the depth/resonance does more than add low end, it changes the amps character and is really a great feature to include. Live poweramp/cabinet set up would finally feel and sound right to people and people in general could dial in the tone they are familiar with like a 5150. I run an amptweaker depth finder after my firebox and it's great to warm up an ss amp and add that speaker interaction. It would be great to have that included.