Re: Quick question about Ibanez wiring diagram
Different curves. There are a *LOT* of different curves for pots but A and B are the most common. I recall Dimarzio(I think) making a 500kW pot which has a curve suitable for both volume and tone.
By the way, if you didn't know. The curve on a pot changes the way it reacts when you turn the pot up and down. ie. one type of curve will give you a more gradial decrease/increase in volume on a volume pot but another curve may not.