Thank you all, I appreciate your help.
@BogdanH Exactly. Those two LIVE CONTROL knobs are very interesting at first, but little bit gimmicky for me personally.
@Al Ram Not that simple I am afraid. I play mostly in large clubs with very large line-array systems with 18 and 24 inch woofers all around the place, some of them are placed well, others not so most of the time I bring only my digital mixer, play pink noise and measure frequency response so I can tweak the EQ to get as flat as possible, so in every location I usually have similar setup and you are right. However sometimes I play in some smaller clubs where we have only 15 inch "plastic fantastic" speakers, which can not play anything below 50hz right in front of them, but if you are standing few meter away the bass is simply non existent so the right is so much louder.
All in all it is not possible to bring my own PA system except when I play weddings, then I choose what to bring with me.
@mikf Actually yes at some extent, but as I said I always tweak the master EQ to get the same frequency response it somewhat solves this, but there is nothing I can do with the difference between 24 inch woofers and small 15 inch middle tone speaker in a plastic box.
@DonM & overover Yes, the volume pedal is the only solution, however I need to buy it, bring it with me and think about it so I do not forget it at home, for example. Also, it is one more thing to think when playing. Yes, it is a solution but having that option in the keyboard, as many other keyboard have, is simply the best option.
@Fred Smith Of course, but I do not have time to play with those buttons, and wheel for both Right 1 and Right 2, the idea was to make the balance before Is tart to play, and then do that for every and each performance and location, very simple. My Roland does this, my Korg does this, Ketron as well, only Yamaha thinks it is not important.