Interesting that the steps are apparently all the same. As far as the customization goes for your headphones, it's a kool idea, but it would be hard to put across exactly what volume you want the step to be at wouldn't it? As in, unless you both manage to use the exact same method for measuring the dB coming from them on the same song, it could be off. It will be interesting to find out some more information.
matthewh133........I think if I were to specifiy a customized volume control it would strictly be to request smaller decibel increases for the first 10 steps.
I didn't hear back from John Delmo today. Still curious what the decible differences there are between each step.