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VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver, accessible as a standard MIDI Out device. If you are a MIDI/karaoke fan, like me, you know that MIDI play quality on Windows systems was not really good out of the box. The bundled "Microsoft GS Wavetable Synth" MIDI Out device is just... ehm... simple: poor samples, mono sound, no effects (reverb, chorus) support.

On 32bits systems some better alternatives exist, like the well-known YAMAHA XG SoftSynthetizer S-YXG50 and Cakewalk-sfz+ (both unsupported now).

Upgrading to an x64 system was a pain for me: S-YXG50 doesn't work at all, Cakewalk-sfz+ was unusable. One day Ian Luck (un4seen) added to his great BASSMidi library a great feature: the possibility to render a live MIDI stream, including SysEx messages. I quickly realized that, if only I could intercept that MIDI stream and drive it through Ian's library, well, we'll get a great MIDI Synth.

The challenge was to create a good quality synth and let the user to stay away from complicated virtual MIDI chains (ever tried VanBasco -> MIDI Yoke/LoopBe1 -> SynthFont chain ?).

User only needs a new virtual MIDI Out device, select it as output on his preferred player settings and... start playing, nothing more.

Here we are, VirtualMIDISynth is the answer: an user mode multimedia x86/x64 driver that works on XP / Vista / 7 / 8 / 10 (both x86 and x64), implemented as a MIDI Out virtual device.

Main features:
User mode multimedia driver, no reboots, no BSOD
Directly accessible as MIDI Out device, no need for virtual MIDI cables (like MIDI Yoke, LoopBe1)
Supports up to 4 virtual devices, each with its own soundfont configuration (new in version 2.x)
Virtually unlimited polyphony (limited only by available CPU power)
MIDI mixer to set track mute/volume, accessible through systray icon
Integrated MIDI converter to easily convert your MIDI files to WAV/MP3/FLAC
Lightweight setup (~1.2 MBytes)
No DLL cluttering, everything is self contained installation folder (except for MIDI device driver) (new in version 2.x)
Clean installer, won't affect other MIDI devices
Efficient RAM usage (allows using large SoundFonts, > 1GByte)
Load soundFonts (up to available memory), enable/disable/chain them at your will; native 64bit version (on x64 OS) is not limited to 4GByte (new in version 2.x)
Configure MIDI Mapper default device (this feature is already available in XP, but missing in Vista / Windows 7)
Windows 8/10 users can also install CoolSoft MIDIMapper and configure it straight from VirtualMIDISynth configurator to get the well-known MIDI Mapper back to their systems
Multilanguage dialogs.
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