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. Oscilloscope: watch what happens to a sinusoidal input signal in real time. Dynamics: use a ramping signal to test compression or expansion, or an attack-release signal to check your compressor’s attack and decay curves. Performance: how many milliseconds are really spent in your plugin’s audio processing callback (as a function of buffer size). Kickstart is the fastest way to get that signature sidechain effect in your own tracks. Audio effect plugin for VST+AU, PC+Mac, 32+64bit. EUR 10/USD 15 only. Test the free trial!

• Oscilloscope Vst Plugin
• Vst Oscilloscope Plugins

“s(M)exoscope is an oscilloscope VST plugin. You can use it to visually monitor audio wave forms.

Features: Sidechain vst plugins free.

• Available as a Standard insert effect or as a special Modular version optimized especially for modular VST hosts like Plogue Bidule or AudioMulch.
• Display controls – Time (number of pixels per sample) & Amp (amplitude of the waveform in the display).
• Retrigger modes – Free, Internal, Rising & Falling – with Retrigger Threshold. External mode also available in the modular version.
• Options – Sync Redraw, Freeze, DC-Kill & Channel.

Oscilloscope Vst Plugin

The s(M)exoscope also contains a tool that can be used to analyze the waveform currently in the display. Based on where you place a marker, the tool analyzes the x and y dimensions of the waveform to calculate the following:

• Selection amplitude (linear).
• Selection amplitude (decibels).
• Selection length (in samples).
• Selection length (in seconds).
• Selection length (in milliseconds).
• Selection frequency (assuming that the selection is one cycle in length).”

Sources :

Vst Oscilloscope Plugins

[email protected]: http://bram.smartelectronix.com/plugins.php?id=4
KVR: http://www.kvraudio.com/product/s_m_exoscope_by_smart_electronix/details