While pleasant to look at, rotary controls on a computer are a pain. Sliders are easier and have the added benefit of letting you click to a point (say 75%) and that's the value you get. They often have little arrow buttons that make it easy to nudge the value up or down. OK, feel free to keep the main controls of Gain, Master, Tone, etc., looking like the real ones on the device. I'd prefer them as sliders, but I can see how that would be a harder choice. The flip side of this today is that the graphical EQ has knobs which is just odd. Here's the interesting thing. An early, sneak-peak of the AA applauded the use of sliders. While I was at NAMM, Tom King was kind enough to invite me to a private (i.e., outside the cacophony of the show floor) preview of the Amplifire. I got some quality hands-on time with the device as well as a run-through of the editor and finally some Q&A around the product. ... While the menu system is quite usable, the editor software (available for Windows and OSX) seems very well thought out. It generally avoids the use of rotary controls instead preferring sliders, which are much easier to adjust with a mouse. The slider controls have text fields for keyboard entry of values as well as increment/decrement arrows make precise control easier. I know that Atomic has limited development cycles and that we want Marc focusing on the next big audio breakthrough, but these ergonomic issues matter a lot.