I found a nice collection of them on the Image-Line forum, on Musical Artifacts, and YouTube is another great place to go. It’s not uncommon to find them on Reddit, YouTube, and other forums including Image-Line’s own forum. To find plugins, instruments, and sounds for FL Studio Mobile, you can access the Shop within the FL Studio Mobile application, or you can look for.
Getting into the Settings is easy, you just have to click on the icon tab in the top right of the interface.
The easiest and most reliable way to get new sounds and instruments into FL Studio Mobile is to pay for them in the Shop.
