Toneboosters has released GonioMeter, a free stereo image analysis and visualization plug-in for macOS and Windows that they describe as "Your stereo soundfield sanity check".
A spokesperson told us, "Visualize the spatial sound field, stereo balance, left/right balance spectrum and correlation spectrum in real time. GonioMeter is completely free and included in our software installer. The perfect tool to ensure that content you create is of high quality and mono down-mix compatible, an absolute must for mobile entertainment."
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