D.i. Boxes for recording?

i record guitars into a digitech metal master pedal and i use the mixer output directly into my audio interface, I always get hum and a lot of fizzine

i record guitars into a digitech metal master pedal and i use the mixer output directly into my audio interface, I always get hum and a lot of fizziness and my question is will buying a d.i. Box help fix this problem and make my recordings better or should I simply learn to fix them in prerecording or mixing?

or:i record guitars into a digitech metal master pedal and i use the mixer output directly into my audio interface, I always get hum and a lot of fizziness and my question is will buying a d.i. Box help fix this problem and make my recordings better or should I simply learn to fix them in prerecording or mixing?

Tags:recording,