Thanks! im glad you like the post!
you can use tools like "autotune" or "melodyne", this are softwares that you can use in any program, the logic has its own tool call "Flex". All of this softwares detect your voice track, show you how out of tune you are and then allow you to tune your voice. Be careful, if you tune a lot your voice you gonna sound like a robot hahaha.
RE: Making a backing track : Everybody wants to rule the world