You could have downloaded FilterSynth 1.0.1 from our software library for free. The software is included in Multimedia Tools. This free program is an intellectual property of DavidPutman. The most popular version among FilterSynth users is 1.0. The FilterSynth installer is commonly called FilterSynthVST.exe.
From the developer:
FilterSynth is a free VSTi synthesizer or SoftSynth.
You can also use it as a stand-alone instrument connected to a MIDI keyboard or sequencer and it will respond to the full range of MIDI commands. It has:
- 4 oscillators with selectable waveforms
- ADSR envelope stage
- filter stage with selectable filter type
- full preset management with 20 presets
You may want to check out more software, such as Solo Guitar Performance Pieces, Blue Cat's Parametr'EQ - VST or Mastering Music, which might be similar to FilterSynth.