Thanks for many answers! Bass guitar in question is ESP LTD D-5
I have checked Z-In -setting, it was on auto. Tried different impedances... Didn't help much
Tried changing input-pad setting, not much difference.
So far Helix has not blown into Oblivion yet! Hehe :) ,I meant that I hooked up Helix to my Bass cab's recording output (roland bass 30 amp)
I tried one guitar and bass in both bass amp and Helix. Difference was very clear. Guitar is much louder. It seems I have some problem with this bass. And yes im using Bass-cabs on helix