Oh snap ! due to its grey tint and since I'm using the main "FFT Gain" knob I tought it was locked. I haven't tried to turn it... Sorry for my mistake.
Plus I've test with a external mic and it's reduce the amount of base (probably the fan in my laptop with the built in mic).
I still have much more bass than middle and high but with the main fft gain plus the gain per effect I can make it works like I want. Thanks