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 as_SonoGx2 by Anton Savov is a Virtual Effect Audio Plugin and a Standalone Application. It functions as a VST Plugin and a Standalone Application.
Product as_SonoGx2
Developer Anton Savov
Price (MSRP)
Type / Tags SonogramSpectrogram
Plug-in, App & Soundware Format(s)
UtilityStand-alone utility / application
Operating System Availability
Download Released
Downloads Released
System Requirements
Win XP, CPU with SSE/SSE2
Miscellaneous Information
Important Note
The Standalone version might freeze/hang sometimes when changing audio settings. The sonogram scrolling will be choppy if the audio buffer length is big.

as_SonoGx2 is a stereo sonogram. It's mostly useful to display the difference between the two audio channels in real time.


  • (Standalone, VST2) Two-channel sonogram, FFT size of 512, displayed as 257 pixels vertically.
  • (Standalone-Big) Two-channel sonogram, FFT size of 1024, displayed as 513 pixels vertically.
  • Linear frequency scale.
  • Selectable display modes.
  • Selectable window type.
  • Frequency (Y) marker (right-click) - shows the frequency of the highlighted bin.
  • Time markers (X) - can be used to measure time durations on screen.
  • Freeze function (left-click to toggle) - freezes the sonogram.
  • Scroll (on/off).
  • Speed - sets the rate at which the sonogram "samples" (applies FFT) 100 to 2000 Hz.
  • Gain - adjusts the gain for the sonogram display.
  • Offset - shifts (delays) one of the channels on the display.
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