SpectrumAnalyzer is a state-of-the-art spectrum analyzer plugin, which offers a lot of opportunities to display the spectral content of your audio material and helps you create a better mix this way. SpectrumAnalyzer comes in two editions, a free and a full version. But you can also use VST plugins (for some people it can be more convenient). We have searched deep deep inside deep deep down inside into the web, to find the best free VST plugins for audio analysis, here’s the selection: 1) Spectrum Analysis. 1.1) Voxengo SPAN. This spectrum analyzer uses FFT to display the signal frequency in real time. SPAN is a free real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit and VST plugin for professional sound and music production applications. SPAN provides you with a very flexible “mode” system which you can use to setup your spectrum analyzer preferences. Seven Phases Spectrum Analyzer is a real-time spectrum analysis VST plugin. The idea was to create an old-fashioned tool reminiscent of classic hardware analyzers of the earlier centuries. Unlike most of other analyzers available these days, this plugin is not FFT-based but utilizes a filter-bank algorithms that mould its unique pros and cons. 2D / 3D Full Featured Parametric Multi Channel Spectrum Analyzer ( VST / AU and AAX ). Welcome to the world of Oscarizor Pro. Parallel waveform, spectrum & stereo field comparison in 2D and 3D using side-chaining and 255 send/receive channels (up to 10 channels parallel) is the power of Oscarizor Pro – especially the multi channel spectrum analyzer in VST / AU and AAX variants.

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If you use Wavosaur for mastering / premastering, or signal analysis in a more general way, you need tools for audio analysis : spectrum analyzers, phase analyzers, sonogram.
Wavosaur comes with analyzers, you’ll find them in the ‘tools’ menu, along with oscilloscopes & statistics about the sound file (maximum sample peak, RMS power, average value.).

But you can also use VST plugins (for some people it can be more convenient).
We have searched deep deep inside deep deep down inside into the web, to find the best free VST plugins for audio analysis, here’s the selection:

1) Spectrum Analysis

1.1) Voxengo SPAN

Spectrum


This spectrum analyzer uses FFT to display the signal frequency in real time.
You can freeze the display, and use the mouse to shows dB values / Frequency value
Frequency is displayed in Hz and in musical note.
The Voxengo SPAN analyzer also displays statistics : RMS power, and it features a clipping detection.

More info and download @ http://www.voxengo.com/product/span/
It is worth mentioning these plugins too, freeware!

1.2) Mdsp SmartElectronix Fre(a)koscope

Very nice, with interesting options for the spectrum display : linear/logarithmic/semitones .
Adjustable size for the FFT buffer. Had sometimes display problem with Wavosaur.
More info and download @ http://mdsp.smartelectronix.com/freakoscope/

1.3) BlueCat FreqAnalyst

Like the previous VST effect, this one can show spectrum of left / right channel or both, has a “hold peak” feature that is interesting, when dealing with EQ level in your mix.
More info & download @ http://www.bluecataudio.com/Products/Product_FreqAnalyst/

1.4) Seven phase Spectrum Analyzer

This one is freely resizable inside the host application (works in Wavosaur)
More info and download @ http://sevenphases.wordpress.com/spectrum-analyzer/

1.5) MultiInspector free

Download @ http://www.vertexdsp.com/downloads.html#MultiInspectorFree

2) Sonogram

2.1) ag-works sonogram sg-1

This free plugin displays a scrolling sonogram for frequency analysis.
You have the choice for the sonogram colors, and many options to tweak the sonogram displays
This is the only sonogram VST we have found for free ! Fortunaly it’s very good.
More info & download @ http://ag-works.net/plugins.sg1.htm

3) Goniometer

3.1) Flux Stereo Tool

When you need to visualize your stereo position, and the repartition in the field, this plugin is very useful. You can check for phase errors in your mixes.
download @ https://www.fluxhome.com/download

3.2) Gonio3

download @ http://www.uk-music.de/index.php?page=downloads

3.3) HOFA 4U Goniometer & Korrelator

download @ http://hofa-plugins.de/pages/start_en/4u_en.php

If you think that we have forget some free VST analyzer plugin in this list, do not hesitate to comment !

Edit:

We just have found this pretty nice analyzer somewhere on our harddisk :

Dust Analyzer:

It provides three modes : spectrum / scope / phase , with “hold peak” option, freeze option, dB/Freq display with mouse, linear / logarithmic scale

more info & download @ KvR audio forum & http://www.signaldust.com/

/fruity-parametric-eq-2-vst-free.html.

Download

Virtual studio technology (VST) is an audio plug-in software interface that integrates a software synthesizer and effects into digital audio workstations. It uses digital signal processing to simulate a traditional recording studio’s hardware in software.

There are both commercial and freeware versions of VST plug-ins available in the market.

Think of VST plugins as an affordable way of making your home studio sound like an expensive commercial studio setup.

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What are the Best Tools to Develop VST Plug-ins?

I have listed a couple of libraries and frameworks that can handle most of the coding required in developing VST plug-ins.

JUCE Cross-Platform C++ Library

It is supported by the following platforms: OSX, Windows, Linux, iOS, and Android. It is free for non-commercial releases, but the commercial license works our best. It also covers 64bit systems.

Pricing of its commercial license

  • Commercial license for a single product – $521
  • Commercial license for any number of products – $912
  • Upgrade from single-product version to unlimited version – $455
    Despite the cost of the license for retail releases, it is the only library/framework option for a 64bit cross-platform.

Watch this video on how to create an awesome distortion VST/AU Plug-in using C++ / JUCE Framework

SynthEdit

SynthEdit is a framework and a visual circuit design that allows you to create your own synths with only drag & drop without programming. Therefore giving you the flexibility of using your DSP algorithms inside the modules.

At the time of writing this the 64-bit version is in Alpha and its creator Jeff McClintock is working on the ability to exporting it to AU. It’s got a ton of community-produced modules and works great with the 32-bit version. It is soft on your wallet – goes for $70.

Check out this video how SynthEdit work –

FL SynthMaker

FL SynthMaker aka flowstone comes free with FL studio.
It has a straightforward drag-and-drop graphical interface and a wide range of components. You can use it to code modules and DSP in Ruby and comes with loads of examples to get started quickly and its ability to assist you in creating a prototype within a short time is a plus.

How Are VST Plugins Made

You’ll be required to source for information from different sources depending on what your specific goals are.

For beginners, before learning how to code VST plugins, I would advise you to check out these environments:

  • SynthEdit, SynthMaker, Reaktor, Max/MSP, PureData
  • CSound, SuperCollider, Bidule, Usine

These environments allow you to build something unique without having to write low-level code which most people find difficult to master. You’ll be required to know different areas, and if you already have some, then you’ll only require to fill in the gaps.

Check out this video to learn how to build and design your VST Plugin using JUCE

Audio Basics

Understanding sound and its properties are essential before embarking on the development of VST plug-ins. I have outlined a couple of online resources you should go through them:

New Free Vst Plugins

Fundamentals of Digital Audio Processing

The Scientist and Engineer’s Guide to Audio Signal Processing

Discrete-time systems, sampling theorem, audio DSP, maths, psychoacoustics, sound analysis, and sound modeling.

Signals, Sound, and Sensation by William M. Harmann

The book got an introductory text on psychoacoustics and the readers on a journey through the mathematics of signal and processing from its beginnings.

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Programming

Many professional VST plugins available on the market have been written in C++.

There are also several other languages you can use, but each got their pros and cons.

Learning how to develop VST Plug-ins as you’re learning to program isn’t easy. I usually recommend learning how to program before starting to create VST plug-ins.

The Audio Programming Book by Richard Boulanger – This book comes highly recommended for those who want to learn audio plug-ins.

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BasicSynth by Daniel Mitchell – This one shows you how to create a custom synthesize in software using C++ programming language.

For more further information about VST development, you should definitely check these resources:

Audio Software (VST Plugin) Development with Practical Application

JUCE framework for VST-plugin development

Maths

You should have some basic engineering mathematics such as linear algebra, complex analysis, among others. Visit this website to get practical algebra lessons: www.purplemath.com.

Digital Signal Processing

You must know what an FFT routine is and why it is useful. Advanced content focusing on audio will usually require you to have at least a conversational level of DSP understanding.

Check out these resources on DSP:

Online and Free:
The Scientist & Engineer’s Guide to Digital Signal Processing

Print:
Understanding Digital Signal Processing by Richard G. Lyons

Audio Digital Signal Processing

Audio DSP extends on core DSP concepts to include the way digital signal processes apply to digital audio. It covers subjects such as audio filters, delays, and non-linear effects; think compression.

DAFX by Udo Zolzer is a book that comes highly recommended and covers many aspects of audio DSP technique.

Check out these online resources to get more info:

DSP Audio Classics
DSP Audio Algorithm Notes by XOXOS

Below are threads on VST Plug-ins I found from a couple of online discussion forums:

Advice for someone with ZERO experience
Developing a Vst Effect Plugin Where To Start?
What is your development setup?

Books

I have listed some books that can serve as a resource in your pursuit of learning how to make VST plug-ins.

Check them here:

Free Trap Vst Plugins

    Designing Audio Effect Plug-Ins in C++: With Digital Audio Signal Processing Theory
  1. Designing Software Synthesizer Plug-Ins in C++: For RackAFX, VST3, and Audio Units

Audio Plug-ins frameworks

JUCE

JUCE is a highly recommended and all-encompassing C++ class library for developing cross-platform software. JUCE includes components for VST, AU, and RTAS. You should have at least a basic grasp of JUCE if you intend to use C++ for the development of your VST plug-in.

IPlug

This is a C++ framework for developing audio plug-ins and GUIs.

VST.NET

It allows VST Plugin developers to write Plugins in any .NET language. It also eases the transition between the C++ and .NET world and its framework built on top of the interop layer provide a clear and structured architecture. Feel free to check this Delphi library for creating VST plugins, VST hosts but also ASIO applications:

Delphi ASIO and VST

It also includes the algorithm for filters and dynamics.

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What is the best programming language for the VST plugin?

C++ is one of the best programming languages for creating VST Plug-ins, and the reason for this is that C++ has a wide range of frameworks and libraries that work so well in creating VSTs. Read more What’s the Best Way How To learn C++?

The WDL-OL library makes C++ an attractive programming language for VST plugins because it helps you with the following:

  • Creating multiple formats (VST, AudioUnit, VST3, and RTAS) from one codebase: Just choose the plugin format and click “run.”
  • Create both 32-Bit and 64-Bit executables.
  • Run your plugin as a standalone application (Windows or Mac). It means you don’t technically need a DAW to use the plugin.
  • Most GUI controls used in audio plugins (knobs, buttons, visuals).

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Understanding what VST Plugins are and their role within the music production industry provides you with the knowledge of identifying the most effective tools for your music production outfit. It makes your music sound like it was produced in a million-dollar music studio.