Qsynth is a free and open source softsynth management application for Linux and Windows. Using Qsynth you can control and manage a variety of command line softsynths. It is a fluidsynth GUI front-end application written in C++ around the Qt framework using Qt Designer. It is released under GNU General Public License (GPL) version 2 or later. fluidsynth is a synthesiser application based on the Soundfont specification.