BASSMIDI Synth Driver is described as 'The BASSMIDI MIDI synthesizer driver is a freeware SoundFont based Windows MIDI system driver (created by kode54 and Mudlord) for Windows XP, Windows Vista, and Windows 7. It uses the BASS and BASSMIDI audio libraries by Ian Luck (Un4seen Developments) as the SoundFont' and is an app in the audio & music category. There are eight alternatives to BASSMIDI Synth Driver for a variety of platforms, including Windows, Mac, Linux, Web-based and iPhone apps. The best BASSMIDI Synth Driver alternative is Virtual MIDI Piano Keyboard, which is both free and Open Source. Other great apps like BASSMIDI Synth Driver are Cynthia, VirtualMIDISynth, Tiny Instrument and Synthfont.
Virtual MIDI Piano Keyboard is a MIDI events generator and receiver. It doesn't produce any sound by itself, but can be used to drive a MIDI synthesizer (either hardware or software, internal or external).
Adjust playback speed, volume and output device on the fly during playback. A large playback progress bar makes jumping forward and backward in time a breeze with just a single click or tap. Supports ".mid", ".midi" and ".
VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver, accessible as a standard MIDI Out device.
Tiny Instrument makes playing, recording, and exploring MIDI keyboards simple, fun, and powerful — whether you’re a beginner or an experienced musician.
SynthFont is a program for playing midi files using SoundFonts. It can also include VST instruments. Midi input for live playback is also supported.
MidiKeys is a small application for Mac OS X that presents a miniature MIDI keyboard onscreen. http://www.manyetas.com/creed/midikeys.html
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More options, frequent updates, works fine