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ok so I play an mp3, get the spectrum (array of 512 floats) but then i want to be able to play only one part of the spectrum, for example bass.
I guess I must select maybe the first 20 of the 512 floats but then how do i re-create sound?

And that point me to an other question. The human ear can hear 20hz to 20khz, so cutting the sound into 512 floats and not 20 000 is not very precise no??
thanx for the help

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You do not use the spectrum you use a filter such as low-pass or parametric EQ to make that effect.

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thank you very much! can i do it with fmod 3? I dont see any functions ‘filter’ or ‘eq’….

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you use the FX api but for far better effect support i recommend using FMOD Ex.

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