DXi is the open standard for soft synth plug-ins and is based on Microsoft DirectX technology. DXi soft synths are the most responsive and reliable software synths available for Windows due to their responsiveness and low latency. Included with Pro Tracks is the Tassman SE synth engine, a modular instrument and sound design environment based on physical modeling. If you are new to the world of synths and sound design, or a seasoned industry professional, the Tassman offers virtually endless possibilities, in an intuitive, easy to use interface.