How to get the FFT for specific channels in the device

Thank you for the clarification. In that case, you can enable metering on a DSP and get the info from there. These DSPs can be placed on a channel group or wherever you feel the need.

https://www.fmod.com/resources/documentation-api?version=2.02&page=core-api-dsp.html#dsp_setmeteringenabled

https://www.fmod.com/resources/documentation-api?version=2.02&page=core-api-dsp.html#dsp_getmeteringinfo

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