| Hi Koki,
Yes, you can adjust relief on both bass and treble side on every bass that has 2 truss rods. It works simple : You measure relief on each side, on the B for the bass side, and on the C for the treble side.
I don't know if they work opposite on the Ibanez BTB, but I don't think so... They should work normal. And if they work normal, there's an easy way how not to forget the direction : The strings bend the neck and the truss rod bends it back. So if you tighten the truss rod (clockwise), you bend it back.
Both truss rods should work the same...
To go for sure, measure the relief, then adjust the truss rod in 1/8 turn steps and then measure the relief again, and you will see in what direction the truss rod goes. You won't brake your neck if you adjust the truss rod in 1/8 turn steps.
Let us know if it worked.
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"We think that Music stops at the ears. That is a mistake. Vibrations can be felt in all places and at all times, even with the eyes." - Victor L. Wooten
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