From the developer: "The program allows you to tweak your YMF7x4 (YMF724, YMF740, YMF744 and YMF754) sound card driver. You can increase quality of WAV and MP3 files and audio CD playback. It installs high quality 4.61 MB wavetable bank, so you can hear GM/GS/XG MIDI files with the professional sound quality. You can control hardware voices between MIDI, audio and game applications, enable hidden features of the driver. It includes also over 1MB of XG MIDI files."
Note: Hardware Voices Controls are disabled and there is scratch noise while playing MIDI in the trial version.