So would I be correct in my assumption that the knob percentage represents a % of 15db (the maximum Andrew mentioned), boosted on the frequency set by the tone setting? Of course, I'm not mentioning the Q factor here since to my knowledge EQ APO only has a graphic EQ and a set Q but I'm fine with a little inconsistency. If I have the bass slider set to 33% in the Poweramp EQ app and the tone frequency is set to 90Hz (I haven't touched that up until now), I can raise the volume of the 90Hz band in EQ APO on Windows by 5db (33% of 15db) and have the same results, excluding the rest of the EQ settings I have? Or would I have to raise the neighboring bands as well by a fraction of what I'm setting the 90Hz band to?
Edit: I understand that you would not recommend using the tone controls. However, I set up those settings years ago when I first bought my current headphones. Back when I was tinkering with the settings it just sounded a lot better to me with the bass knob up 33% and treble up 35%. In a sense I'm trying to remove my reliance on them here and just translate the settings to a graphic EQ only so I can have the same sound everywhere I plug the headphones into.