How to find largest value and its position in memory array?

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you don't need to push fft output forward. All you need is check the fft frame when ready for peaks. The location of peak need to be adjusted for latency issues so you need to check that in simulation.

For multiple peaks you shouldn't use max value, instead you need to define an absolute threshold to define your peaks then check fft output against that threshold, save peaks accordingly.

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ok i'll try... hope i can do it... thanks!