I don't really go into exactly how I did this, but you can see the Logic screen. I use automation to change the pitch levels and use a Cycle to loop the playback. It serves as a neat live sound. It wouldn't work for recording unless you drew the automation throughout the whole song. There might be a better way to do this, but this seems to work well enough for my purposes. Only built-in plugins are used.
![](https://s2.save4k.ru/pic/ybQWc_4PGWs/maxresdefault.jpg)