Ok, after having my AFB for sometime now I really miss the res control on the amps designed with one. Like the presence control, it is a much needed control for the tone of these amps. I know you can't add every feature that every amp has, but to model the presence and not the resonance is something I can't understand. To me it's a huge control missing.
Actually you could add the bottom from the cabinet onto the amp so its usable with or without impulse, cause now you have the actual resonant frequency for that specific amp