I'll love to say Garage band on iOS but however it doesn't allow you to manipulate the soundtrack enough it come with 5 to 6 preset auto tune that you not gonna find useful
But it allows you to make instrumentals that can be useful for sound effects. And multiple tracks
Sunvox lets you edit track and more
How ever the app is 5 bucks on the apps store
If you looking for a good cheap window apps I'll say try "acoustica mixcraft" it's a great app that we use to demo our our artist at Yality Music Group YMG before going to a recording studio.
And we also use it for podcast it created. Great sound effect and plugins. If u a Mac user garage band is already pre-install I think I've use it it great too
If this post help please like and follow if there any error feel free to leave a comment