Soundboard will not do the trick. Fiberglass insulation is as good as it gets.
Is there a specific insulation you recommend? Or any fiberglass insulation will do the trick? I have used Roxul, but i am willing to try some other options if they are cheaper. Thanks
Generally R13 fiberglass in a wall, or R19 in a ceiling. Avoid labels that say "acoustic" or "sound control." Just get the cheapest stuff you can find