Presets: I love to have VST libraries that have a ton of presets. With that being said, try and find the highest quality sounds in each VST that you for FL Studio. Sound Quality: If you choose to go the free route, that is totally cool, however, you will definitely run into some abysmal options. 9 Why Use Additional Plugins For FL Studio.7.2 Phase Distortion Snapin By Kilohearts.5.3 MJCUjr By Klanghelm – Free compressor.1 Best FL Studio Plugins – A Quick Glance.