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Here you'll find technically much more advanced plugins than Saguaro.one. Rex at Flowstoners.com has created a ton of VST plugins using FlowStone. Ranging from synthesizers, samplers and effects to various simulations of rare acoustic instruments. Alot of his creations are based on physical modelling techniques.

Take a listen to Rex and his plugins (youtube) and try some of them out. His Flowstoners page also feature other creators plugins as well...

Quilcom plugins

1st Generation overview

Quilcom Adder

Instrument:
Additive synth using sine partials

Quilcom Beater

Instrument:
Percussion synth

Quilcom Blender

Instrument:
Waveform morphing (crossfading) synth

Quilcom BlueSky

FX:
16 band vocoder
(incl built-in synth)

Quilcom Clipper

FX:
Hard-clipping distortion

Quilcom Dalek

FX:
Ringmodulation voice-changer

Quilcom Divider

FX:
Voice-controlled synth effect

Quilcom Transformer

Instrument:
Additive synth using 24 partials

Quilcom Multiplier 2

FX:
Quadruple chorus and pitch-shift effect

Quilcom Unison

Instrument:
Synth with 4 unison generator sections

Quilcom Snake

FX:
Multi-tap delay

Quilcom Subtractor

Instrument:
Experimental synth based on Noise generators

Quilcom Spectre

Instrument:
Easy-to-program additive synth using sine partials

Quilcom 111

Standalone:
Brainwave synchronization

Quilcom QX7

Instrument:
FM synth inspired by the Yamaha DX7

Quilcom Devilish

FX Visual:
Generate Lissajou curve figures

Quilcom Devilish 2nd

FX Visual:
Generate Lissajou curve figures

2nd Generation overview

Quilcom Q50

Instrument:
Inspired by Roland D-50
Subtractive synthesis combined with complex sampled waveforms

Quilcom 4EA+

Instrument:
Additive FM synth

Quilcom Mistress

FX:
(screenshot 1/2)
Multi-function mastering tool for stereo mixing

Quilcom Mistress

FX:
(screenshot 2/2)
Multi-function mastering tool for stereo mixing

Quilcom Weapon

FX:
One-knob compressor/limiter with automatic gain make-up

Quilcom FYB

FX:
Aural exciter / psychacoustic enhancer inspired by the Aphex

Quilcom PlusMinus

FX:
Mid/Side stereo mixing tool

Quilcom Nine

Instrument:
Scanning synth inspired by Reasons “Nostromo” Rack Effect

Quilcom Whirlipan

FX:
Mono to Stereo panning effect primarily for headphones

Quilcom Spanner

FX:
Mono to Stereo diffusion-effect primarily for headphones

Quilcom Ringer

FX:
MIDI-controlled polyphonic filter effect plugin

Quilcom Folder

Instrument:
Synth with wavefolding as found in Buchla and others

Quilcom M2S

FX:
Mono to Stereo effect with 10 individual processing types for pseudo-stereo

Quilcom Stage

FX:
Stereo enhancer with 9 processing types for adding width, localisation, vibrancy and depth

Quilcom Vocoral

FX:
Creates 20-part stereo unison from a mono source. Primarily for use with vocals

Quilcom Waterfall

FX:
Delay effect for creating new sounds. Insipred by 112db’s Cascade synth’s “cascade” section

Quilcom Vectomorph

Instrument:
Synth using vector oscillator designed by MV. Visit at: http://mv.saguaro.one

Quilcom Harvester

Instrument:
Polyphonic granular synth using any wav file

Quilcom Vover

FX:
Voice-over tool with compression and ducking

Quilcom Peakyboo

FX:
Transient shaper effect

Quilcom 7SAW

Instrument:
Synth inspired by the Roland JP-8000's Supersaw

Quilcom Informant

Instrument:
Synth for exploration of formant synthesis, shaping and sequencing

Quilcom ASS

Instrument:
Analogue Sounding Synthesiser that can be switched between analogue or digital mode

Quilcom PMS

Instrument:
Physical Modelling Synthesiser. A general purpose synth capable of emulating wide range of acoustic instruments

Quilcom WC

Instrument:
Subtractive multi oscillator synth featuring a Wave Concatenator

Quilcom Christmas Belly

Instrument:
Extensive Wind chime emulation

Quilcom WC mk2

Instrument:
Subtractive multi oscillator synth featuring Wave Concatenation. Version 2 with extended modulation capabilities

Quilcom Granch

FX:
Chorus-type effect utilizing grains

Quilcom Grecho

FX:
Granular Echo effect

Quilcom Gressor

FX:
Granular processor effect. Can record, load up sounds (wav) or be used in a live stream

Quilcom Wavemaker 4

Utility:
Tool for creating and processing single cycle waveforms for use in synths and samplers

Quilcom Blender mk2

Instrument:
Vector synth/sampler that mixes between 4 sound sources using a recordable on-screen joystick

Rank Two

A pipe organ simulator. One of many examples of Rex's plugins and a further development of his first Rank plugin...

3rd Generation overview / SIMs & physical modelling

Quilcom Rank

Instrument:
Synth simulating ranks (sets) of organ pipes. Uses additive & physical modelling techniques

Quilcom Caster

Instrument:
Granular synth with inbuilt sounds. Also loads wav files or records directly

Quilcom Faranear

FX:
Simulates distance from a sound source

Quilcom Rank Two

Instrument:
Pipe organ simulator. Extended version of the first Rank synth adding reed pipes

Quilcom HarpVerb

FX:
Tuned reverb inspired by Pianoverb & Sympathizer. Rex's own take on similar effect system

Quilcom TERRORMIN

Instrument:
Inspired by Léon Theremin's instrument and the design of Moog's Theremini

TERRORMIN mk2 (v1.101)

Instrument:
The Terrormin synth but 64-bit update and a new GUI made by Kevin Brown

Quilcom MIDIMUS

Instrument:
The Mouse-control part of the Terrormin turned into a separate MIDI controller plugin

Quilcom Flooper

Instrument:
Plugin to create compounding loops

Quilcom Bridgit

Instrument:
Bridge or crossfade one audio clip into another over an adjustable region

Quilcom BFP

FX:
Barber pole Flanger. Gives illusion of continuously rising / falling flanger effect

Quilcom B-2 KICK

Instrument:
Kick drum synth also capable of other percussive sounds. Can in addition record and export WAV files via built-in recorder

Quilcom TOMSNARE

Instrument:
Drum synth devoted to “pitched” sounds w/o snare. Loads & records WAV files. Can isolate part of loop and layer with the synth sound

Quilcom B-2 CYMBALLIC

Instrument:
Percussion synth devoted to cymbal sounds and similar

Quilcom B-2 SHAKE & SCRAPE

Instrument:
Percussion synth for shake and scrape or similar noises

Quilcom B-2 BELLY

Instrument:
Percussion synth specifically for bells and similar

Quilcom Section

Instrument:
Synth simulating an ensemble (brass and string) without using conventional delay-based chorus system

Quilcom Phadex

Instrument:
Phase Distortion Synth with an enhanced take on the principles behind Casio’s techniques of sound generation

Quilcom Phadex mk2

Instrument:
Phase Distortion Synth. Updated GUI and can load single cycle wav-file. Waveform is stored in preset as a wavetable

Quilcom 4DS

FX:
Delay effect featuring 4 independent delay lines. Features an input matrix allowing for complex sounds

Quilcom SIM-PF

Instrument:
Synth simulating a pianoforte

Quilcom SIM-EP

Instrument:
Simulate electric piano sounds like the much revered Rhodes and Wurlitzers

Quilcom SIM-HC

Instrument:
Simulates Harpsichord-like sounds

Quilcom SIM-CLAV

Instrument:
Simulates Clavichord and Clavinet sounds

Quilcom Padulator

Instrument:
Synth for rich pad-type sounds but capable of more

Quilcom Padulator mk2 (v1.004)

Instrument:
Synth for rich pad-type sounds but capable of more. Updated with GUI created by Kevin Brown

Quilcom RazorBlade

Instrument:
Synth inspired by the classic 80’s Ensoniq ESQ-1 and SQ-80 synths

Quilcom PTS

Instrument:
Synth using Pulsar Train Synthesis (granular technique) and inspired by Hamburg Audio’s Nuklear synth

Quilcom Trout

Instrument:
Synth tribute to the Trautonium, first invented in the 1930's

Quilcom CHAOS

Instrument:
Synth for exploring Rex's take on chaotic oscillation technology

Quilcom Sim-BP

Instrument:
Simulates many different types of bagpipe

Quilcom SIM-W

Instrument:
Simulates the Tin Whistle

Quilcom SIM-F

Instrument:
Simulates the fiddle/violin

Quilcom SIM-HG

Instrument:
Simulates different types of Hurdy Gurdies using a wide range of parameters

Quilcom Mystery

Instrument:
Synth designed to explore specific technique where additive partials can be amp-modulated with independent polyphonic LFOs

Quilcom SIM-CARNYX

Instrument:
Simulates an ancient Iron Age "Celtic war horn"

Quilcom Director

FX:
Directs a stereo input to two stereo outputs depending on the incoming level

Quilcom SIM-SHENG

Instrument:
Simulate an ancient class of Chinese mouth organs

Quilcom SIM-WINDHARP

Instrument/FX:
Generates the sound of Aeolian harps, together with wind & tree rustling.
Detects as effect plugin but inputs are for sidechain control of the wind speed

Quilcom SIM-DIDGE

Instrument:
Simulates the Didgeridoo

Quilcom SIM-KZ

Instrument/FX:
Simulate the Kazoo using a microphone input to process your humming voice. Plugin detects as effect for inputs

Quilcom SIM-DIZI

Instrument:
Simulates the Chinese Dizi flute. Bamboo flute with membrane to create a brighter sound

Quilcom SIM-GYIL

Instrument:
Simulates the African Gyil a xylophone with distinctive buzzing sound

Quilcom SIM-MBIRA

Instrument:
Simulates an African Mbira (knows as Kalimba in the westernised version)

Quilcom SIM-DJEMBE

Instrument:
Simulates the African djembe drum

Quilcom SIM-DUNUN

Instrument:
Simulate the African Dun Dun drum and the various sounds it makes including the so-called Talking drum

Quilcom SIM-ALPHORN

Instrument:
Simulate the remarkable Swiss long-horn

Quilcom SIM-DUNGCHEN

Instrument:
Simulates the Dungchen a traditional Tibetan horn instrument

Quilcom SIM-GONG

Instrument:
Simulates gong-like sounds. No samples used just like with Rex's other simulations

Quilcom UPVerb

FX:
Unusual Reverb effect that in contrast to regular reverbs keeps high pass content in the reverb-tail rather than dampening it

Quilcom SIM-MIJWIZ

Instrument:
Simulates the Mijwiz an Arabic reed woodwind instrument. It can also be used for simulating the Arghul and Sipsi

Quilcom SIM-CHAU

Instrument:
Simulates a Chau gong known as tam-tam, a Chinese or symphonic gong

Quilcom GONGVerb

FX:
Effect version of the Quilcom SIM-CHAU. A novelty effect not intended as a "serious" reverb

Quilcom SIM-HANDPAN

Instrument:
Simulates the PANArt Hang, a handpan drum

Quilcom SIM-THROAT

FX:
Effect plugin that simulates throat singing by being fed vocal content

Quilcom SIM-GUZHENG

Instrument:
Simulates an ancient zither-like Chinese instrument

Quilcom SIM-REED

Instrument:
Simulates reed woodwinds in general. Not targeted at any specific instrument and has a wide range of timbres

Quilcom SIM-RHYTHMICON

Instrument:
Explore & play a simulation of this remarkable polyrhythmic instrument made by Leon Theremin in 1931

Quilcom SIM-SQUEEZE

Instrument:
Simulates a range of bellows-driven free reed instruments. One of course being the Accordion

Quilcom HYPERBEAM

Instrument:
Simulates the 5 meter-long “Blaster Beam” Craig Huxley used to make effects for the soundtrack of Star Trek and other movies

Quilcom SIM-GANGSA

Instrument:
Simulates a Gangsa. Two types of Gamelan instruments, a metal xylophone and a flat gong

Quilcom SIM-CELESTA

Instrument:
Simulation of a Celesta (or Celeste) and can do glockenspiels and more

Quilcom COD Chorus

FX:
Cross-fading Of Delays effect. Might be an unique invention of Rex and has little to do with the Atlantic fish!

Quilcom COD

FX:
Echo effect that makes use of Cross-fading Of Delays to provide an experimental scrambled or glitchy echo effect

Quilcom SIM-FBK

FX:
Simulates guitar feedback. For use with a real guitar you’ll need to use a compressor on the input for long sustain. More info found in it's User guide

Quilcom SNARED

FX:
Create a sympathetic snare rattle from an input audio source

Quilcom SIM-CIMBALOM

Instrument:
Simulates a Cimbalom (chordophone)

Quilcom SIM-CLAP

Instrument:
A clap synthesizer with useful paramenters

Quilcom SIM-AUTOHARP

Instrument:
Simulates an Autoharp. A zither with key/scale buttons to damp unused strings when strummed

Quilcom SIM-MANUHARP

Instrument:
Melodic version the SIM-AUTOHARP. No strumming but played with MIDI in conventional way. Option for sustain pedal

Quilcom SOUNDBOX

FX:
The soundbox effect found in, for example
Rex's SIM-AUTOHARP now available as a separate plugin

Quilcom SIM-GUQIN

Instrument:
Aims to simulate aspects of Chinese zither. Made as easy to play as possible in plugin form. Watch demo video and read User Guide

Quilcom STAMP

FX:
Experimental tube saturation/dist based on asymmetrical saturation. Creates stereo effect from mono input. Typically a guitar

Quilcom Cabsynth

FX:
Simulates guitar speaker cabinet without the use of Impulse Responses and instead offers adjustability

Quilcom Pipeverb

FX:
Reverb tuned primarily for pipe organs. Originally used in "Rank Two" plugin but by popular demand now as separate plugin

Quilcom Electric Bird

Instrument/FX:
A novelty synth designed to create sounds resembling bird songs and calls

Quilcom EXTORTION

FX:
Experimental distortion that uses one of MV’s amazing modules. Resulting sound is independent of input level so this distortion uses no “Drive” control

Quilcom BLUR

FX:
Inspired by feature of FL Studio, BLUR can create pad-like output in realtime even from short-note arpeggios by smearing sound using convolution technique

Quilcom OCTOTAP

FX:
Unique Multitap delay with output from each tap. Allows for adding own FX to each tap and optionally feed it back into the delay

QuilCom Ghost Radio

FX/theme:
Halloween 2023 plugin. Generates shortwave radio band tuning fx. Allows for fake EVP (Electronic Voice Phenomena) adding your own spooky spoken words. More info in User Guide

Even more plugins?

Check out Rex's page for any updates...

K Brown plugins

http://kbrownsynthplugins.weebly.com/

K Brown has built a myriad of different synths and equalizers. Well over 100 of them.

Not emulations, but structurally based of original hardware synths. Some with added/enhanced features beyond the original....

Adam Szabo plugins

http://adamszabo.com

Also check out Adam Szabo's Viper, a plugin recreating the sound and aspects of the infamous Access Virus synth. Psytrance instrument number 1.

Viper is a commercial project that shows what Flowstone's engine is capable of in the hands of a pro developer, with help from the best and possibly the creator of FlowStone itself.

Professional in every single detail...