Depending on the effect, you may be able so simply raise the one copy in Mac's example.

For instance if you have a vocal track you want to add delay (or reverb) to, you could set the copied tracks effects to be 100% wet and simply 'add' the effect to the other track. That will only work for certain effects and needs, but it's another option (instead of cross fading them as Mac suggested, and trying to match the two). Then you could also Cut all the un-needed parts of the copied track to make things even easier (no Volume Controls needed in some cases)


I do not work here, but the benefits are still awesome
Make your sound your own!