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.).

  1. Bxstereomaker creates a virtual S signal with analog style filters using Brainworx legendary M/S stereo algorithms. This plugin will take any mono signal and make it stereo while allowing you to balance the center position. You can even focus the process on specific frequency ranges in your signal. And you can solo the virtual S signal!
  2. Using Ozone Imager, you can visualize and change the stereo image of your sounds, essentially allowing you to widen or narrow down your mix. Get it here: Ozone Imager Effect Plugin (FREE Download) 8. Krush is a bit-crusher with the ability to reduce bit depth and sample rate.

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:

Free instant audio imaging Updated in 2019 with immersive, fluid visuals, full resizability, and a smooth new Stereoize mode, this free plug-in offers a wider world of possibilities for imaging in your mix. Download the Best Free Audio Plugins. Synths, Reverbs, Compressors.and much more. Just click and download. Search results showing audio plugins for all operating systems (Windows, MacOS, Linux, iOS and Android), tagged as Stereo Imaging. The results are sorted by date added (newest first). Pumper Stereo Image. By W.A Production. The Stereo Module of Pumper. Pumper Stereo Imager is a stereo image processing plugin which enables you to create wideness within your mixes. With this simple yet effective plugin you’re able to add width to your sounds by using one single knob, without creating phasing issues in the mix.

1) Spectrum Analysis

1.1) Voxengo SPAN


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

Free Vst Stereo Imager Am Fm

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

Free

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/

Free multiband stereo imager vst


Stereo Expander Vst

Using Multiband Stereo Image Modifier Lite you can freely change the sense of space, in 3 different frequency-ranges. Mid/Side mode optimalizes the audio sign. You can change the volume or stereo image with the Mid/Side volume functions.

Graphic frequency range handler interface: It can manage 3 different frequency ranges. The overlay of the different ranges can be changed with the vertical white lines. The ranges are colour-coded. When used, the vectorscope shows the stereo images of the ranges, and therefore you can see on the graphic display if the sense of space is correct.

Side volume: Adds to the sense of space. In middle-state there is no change. Pushing the slider up the sign changes to mono, pushing it down adds to the sense of space. Deafult value is 128.

Free Vst Stereo Imager Transmitter

/pink-free-vst.html. Mid volume: Changes the volume of the mid-channel Useful function, because it lowers the middle sounds’volume – like the kickdrum or the vocal zone. Default volume is 256.

Volume: All 3 frequency-ranges’ volume can be changed separately.

Modifier on/off: In off mode the switch turns off all the effects in the program.

Band buttons: These buttons are used to turn on and off the different frequency-ranges. When turned off, it turns off the whole stream of signs from the ranges – meaning that both effects and the original sign will be turned off. In this state the frequency-ranges’ interface can’t be seen, therefore it’s easy to tell which range is on or off.

Stereo Imaging Plugin


Best Stereo Imager Plugin

THIS PLUGIN IS FREE FOR ALL CUSTOMERS. THIS MEANS YOU NEED TO HAVE AT LEAST 1 PRODUCT TO USE IT, LIKE GODLIKE MASTERING PLUGIN OR OUR BOOK. IF YOU NEED TO USE THIS PLUGIN YOU DON'T NEED TO DROP THIS PRODUCT INTO THE BAG. JUST BUY SOMETHING AND YOU CAN DOWNLOAD OUR ALL FREE PRODUCT WITH THE PURCHASED PRODUCT!