ESI MAYA22 USB audio interface (https://www.esi-audio.com/products/maya22usb/) is not officially supported for Linux. However, it complies with the "USB audio" standard and works under Linux, except for special control functions. This project is a GUI application for managing these functions in a Linux environment. Thanks to another existing project (https://github.com/rabits/esi-maya22-linux) for ideas.