Hi User 905133. I don't have a MIDI synthesizer installed. I copied the midi files from an old, long deceased computer and wanted to hear what I had created. The old computer definitely had a midi interface (along with IDE drives). I was trying to download and install some fluidsynth sf2 files because I do have vlc. Although I have been to what appears to be the fluidsynth website I have not succeeded. They have installation files for Linux and Apple, but no files for Windows that I can identify. I am definitely going down a rabbit hole now. Thoughts? Moshe