You need to resample sound. If you play sound faster everything will sound higher like Mickey Mouse. At 2 or 4 times the speed I think is a simple step, just o

You need to resample sound. If you play sound faster everything will sound higher like Mickey Mouse. At 2 or 4 times the speed I think is a simple step, just omit every two or three of four samples. Anyway, this gives different distortions. I am Deaf so I don't hear the distortions but I understand sound in a mathematical way. At a sampling rate of 44.1k the highest representable sound is about 22kHz. At 4 times the speed this is only the fourth of it, about 5500 Hz. If higher sounds aren't filtered they will wrap around and re-appear as low frequency sounds. I imagine that this sounds very weird. And for n not being a power of two or at 8 times or more, you need to resample sound. Transform the samples into the frequency domain and back into the time domain but sped up. This is quite a mathematically heavy operation and probably there are other limits I don't know of.