SyFonOne 1.100 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. SyFonOne works fine with 32-bit versions of Windows XP/Vista/7/8/10/11. The actual developer of the free software is Kenneth Rundt.
The most popular version of the tool is 1.0. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. SyFonOne.exe or Viena.exe are the common file names to indicate the SyFonOne installer. The software lies within Multimedia Tools, more precisely Players.
From the developer:
SyFonOne is a tool for playing midi in real time from a midi input port. Connect SyFonOne to your keyboard port or to a virtual midi relay port like MIDI Yoke, Maple. or LoopBe1. Choose the virtual midi relay port as the output port in your midi player.
You may want to check out more software, such as QuickPlay, JDJ or Music Bot, which might be similar to SyFonOne.