To use it as a plug-in, use an AUv3-compatible host app such as Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others.
ToneBoosters GonioMeter is a one-stop stereo image analysis AUv3 / IAA plug-in.
ToneBoosters GonioMeter will appear in the list of Audio Unit extensions for effect plug-ins.
Since most iOS devices only have mono microphone capabilities, we strongly suggest to use the integrated AUv3 plug-in (app extension) version instead.
The ToneBoosters GonioMeter stand-alone app captures the microphone input and processes the signals in real time.