you usually tune by ear....if your ear isn't that tight...use a piano or a sine wave to figure out the area you should be in. BUT To tell you the truth it's really an ear thing though..and there really isn't a trick for that at all...you either can do it or can't unfortunately. And if you can't well then you better be taking some music classes in theory and ear training to help you along. Cuz there are a hell of alot more difficult scenarios that are gonna keep you way more busier than tuning a kick. LOL!
"you bust your ass to make all the money you can...thinking it solves shit...and then you realize..when and if you get there at all...you got more problems and you missed out on the one thing you can't buy or get back...your life! Spend time with friends and family...You can be broke in other ways too!...."