Wheel building isn't some black magic thing and stories of cassettes with the correct note for "some" wheels doesn't help shake it.
If you have a good quality rim then all the spokes should sound the same, don't worry about getting them to a certain note or pitch, wheels vary from rims, hubs, spoke butting and number of crosses, so it's unlikely that two wheels will sound the same.
If you have a lesser quality rim (most trials rims then) then you may have to tighten some spokes more than others to get a true wheel, this isn't ideal but it's just what happens, in this case the spokes won't all sound the same.
Just concentrate on turning all the spokes evenly to start with, then see how true the wheel is looking and go from there. If the wheel is fairly true then you can work on getting a bit higher tension in the spokes, if it's all over the place, get it true (by tightening AND loosening the nipples) and go from there. I have access to a Parks spoke meter, but I rarely use it as it usually tells me what I already know from the feel and sound of the spokes while building.