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It depends on the application.

16bit is enough for representation.

24bit is enough for recording (some leeway because recording levels won't be ideal).

FP32 for processing with simple effects (e.g. mixer, some EQs). If that's enough for your needs, you can SIMD/GPU to your heart's content.

FP64 for high Q filters, phasors, LU decompositions.



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