Today, I learned not to care about being, "Correct," being perfect in making music, or only using the instruments I make from scratch.
If you try to follow any strict rules with harmonics or try to get an exact sound in a DAW,
it's very rare that you will get something you're happy with.
If you know how to make a chord, and you're comfortable enough with your program to edit a few things, just grab some acceptable synth presets, write some simple music, and alter it after you play what you like. Also, don't judge an instrument until you write with it.
Just a tip - don't write too complex of music in one instrument until you've got several instruments doing something simple, or you might back yourself into a corner. Basically, plan it out before you detail it. Unless you just want one instrument, which is fine, but this can still help.