VST Instruments and Effects for Windows

Solcito Musica VSTs/VSTis are designed with Flowstone software.
The filters and effects such as chorus, flanger, echo, etc. that are included in those VSTS/VSTis are from the Flowstone library. Those filters/effects were included as original or with some modifications.

SuperTron 2.6 FREE!
Step Modulation Analog Synth
The Best Free on BPM-Music Read more... 
The 12 Best Freeware Synths on MusicTech Magazine
Computer Music Special Magazine 
Ten of the Best on Music Tech Magazine 
SuperTron is a virtual analog synthesizer that generates sequences typical of the 70s and 80s, Dance, Trance, percussion, analog strings and other retro sounds. It has functions for live performance, allowing changes in several controls with one click. The Step Modulator has 4 "scenes" that work as sub-presets. The filters bring special features for working in the stereo panorama spectrum. The "Vintager" effect generates vintage warmth to the sound.

This video is courtesy of 0dB (Polonia) - Thanks Tomasz!

 Toum! 1.0
Kick-Tom-Percussion-Bass Synth
Stand-Alone Full-operative: FREE! 
VSTi (dll): donate $16.00 /  16.00

Toum! is a virtual synthesizer to design kick, tom, timbal, percussion and bass sounds. The user can use the include presets or make their own analog, acoustic and electronic drums, and EDM bass synth sounds. Also can be designed snares, clap, hats and certain FX sounds.
Toum! has a virtual analog structure and a small phase modulation component.

The user can load a tutorial preset bank with onscreen guidance text. It is included in the download package.

Listen Toum! soundtrack demos at KVR

It brings the instructions to get the VSTi version.

 Arido 3.2
Additive Synth
Stand-Alone Full-operative: FREE! 
VSTi (dll): donate $12.00 /  12.00
If already got Arido 3.1 VSTi:  FREE! 

(download Free Stand Alone
Version for instructions to get the VSTi)

Arido is an additive synthesizer with a simple
FM feature and a subtractive filter.
It includes a polyphonic driver to generate variety of timbres. That is, a distorter that works on each note separately.
This synth allows make sounds like ambient, bass, pads, organs, distorted, nature, emulations, etc.
It brings on-panel help, MIDI Learn and pedal switch functions.

Kujashi is a great german composer and performer. He made his own soundbank for this composition. All sounds and effects were made from Arido, except drums. 

It brings the instructions to get the VSTi version.

 SuperSonico 5.1
Virtual Analog Synth
Stand-Alone Full-operative: FREE! 
VSTi (dll): donate $8.00 /  8.00
If already got SuperSonico 5.0 VSTi : FREE! 

(download Free Stand Alone
Version for instructions to get the VSTi)

SuperSonico is a virtual analog synthesizerIt has a single oscillator with a generator of harmonics that can be detuned from each other. These can be adjusted to different scale/chords intervals to make fat sounds and one-finger chords. The Sub-Oscillator includes an option that generates a single low octave that is repeated along the keyboard.
When doing a click on some controls or zones, it will appear a contextual help.
This synth is suitable for classic analog sounds such as moogy sounds, strings, bass, brass, leads, organs, atmospheres, pads, drums, emulations, toon sounds, etc.

listen SuperSonico demo by Kujashi

Another brilliant work of the german composer and performer Kujashi. He made his own soundbank for this composition. All sounds and effects were made from SuperSonico, except drums. 

Free Download SuperSonico 5.1 Stand Alone

It brings the instructions to get the VSTi version and notes about the version.

Crio 2.0
Step Modulation Synth

 Crio is a virtual monophonic analog/FM/Ring Modulation synthesizer to make arpeggios, bass, solos, leads, FX-style sounds, to be used at studio or live. Minimal controls, maximum functionality. It brings facilities to drastically modify the sounds on the fly, while playing. The LFO has special functions for rhythmic uses, such as quantization of waveforms synchronized with tempo. The user must use the Modulation Wheel to check the importance of the modifications that can be done at live.

Free Download Crio 2.0 VSTi

Free download New Features Crio 2.0 bank
Several presets of this bank show the new features of Crio 2.0

Vintager Toy 1.1 FREE!
Old sound maker effect

It is a VST plugin that modifies the sound to make it sound like on old equipments. It can be used over a mix or over an instrument to give it vintage warmth.

Free Download Vintager Toy VST

View a Japanese video demo of Vintager Toy by dtmstation.com

BabyTron 1.0 FREE!
Analog / Phase Distortion Step Modulation Synt

Analog and Phase Distortion Virtual Synth with Step Modulator. It´s the younger brother of SuperTron, with some important differences. It has no Chorus, no Delay, no Reverb. Just 1 Oscillator, 1 Envelope, 1 Filter. That´s the way to demonstrate that it can make complex sounds without these effects.
BabyTron hides automatically the knobs that have no action in some given situations.

EmulTuition FREE!
FM Synth
EmulTuition is an FM (to Oscillators and Filters) and Subtractive Synthesizer. It has useful parameters to emulate typical sounds and instruments and to create new sounds (acoustic, dance, pads, animal, industrial, etc.). Several parameters are modulated by the key velocities and key notes, which increases the naturalness and expressiveness of each created preset.

Free Download EmulTuition 6.3 Stand Alone  
      Free Download EmulTuition 6.3 VSTi
Here is a video that shows features of Emultuition 6.3:

Patagon 6.1 FREE!
Virtual FM - Analog Synthesizer with step modulator. It´s make electronic arpeggios, pads, acoustic instruments, etc.. The step modulator, the LFO and the Temolo are synchronized with the tempo.

Sonico FREE!
Sonico is a synth with analog - retro "features": mono keyboard, mono output, no velocity. I made it as a thank to Escuela Sonica (Buenos Aires, Argentina), and it was inspired (is not an emulation) by Torturator, a hardware synth I made in the '80s with chips 555 and binary CMOS counters. The design is focused on the largest possible diversity of presets with minimal controls.