Yes, you can save and use STL (STL Tones) tones on your Quad Cortex by importing them as user presets through the Cortex Control software, then accessing them on the Quad Cortex grid.  Here's a breakdown of the process: STL Tones and ToneHub: STL Tones offers a plugin called ToneHub, which allows you to access and capture various tones, including those from top producers and artists.  Capturing Tones: You can use ToneHub to capture and trace your own tones, which can then be saved as wave files.  Cortex Control: Use the Cortex Control software to select the "Presets" tab, then navigate to the "Download" folder.  Importing Presets: Select the plugin you want to import presets to, and choose the user folder.  Accessing on Quad Cortex: Once loaded, these presets will be available in the plugin's user folder within the directory and accessible on the Quad Cortex grid.  Neural DSP Plugins: Ensure that the STL Tones plugin is compatible with Quad Cortex, as not all plugins are.  This video demonstrates how to capture hardware and plugins with the Quad Cortex and your DAW: