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I've tried a few different time stretch tools and they all yield the exact same results of distortion and no high frequencies. How do you slow down samples without making them sound terrible?

  • Can you add which tools you've tried so far along with any relevant settings, should help getting a better answer. – Simon Bosley Jul 2 '18 at 9:23
  • Audacity, Edison, Waves – PixelLove3D Jul 2 '18 at 20:29
  • What do you mean by samples? Sample rate, or sampled recordings? – Timinycricket Jul 6 '18 at 9:41
  • Either, sampled recordings require a fixed sample rate. – PixelLove3D Jul 6 '18 at 17:54
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REAPER has multiple different time-stretch algorithms that can be used, each with their own sound and strengths. Try experimenting with those. Additionally, if you are losing high-frequency content, consider adding a harmonic exciter to the stretched sample to add more "shine" back to it

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Time stretch tools can't produce (or interpolate) frequencies that aren't there. If you are planning to time stretch a signal, sample with 96kHz at least. Assuming that your microphone and A/D converters play along, that should give you signal content (even if its quality degrades in the inaudible ranges) to somewhat above 30kHz. When time-stretching, this gives some meaningful content to bring down into the audible range rather than the dead silence above the cutoff frequency that otherwise has to be there.

  • I've already recorded samples at 96kHz and I get the same problem. – PixelLove3D Jul 30 '18 at 20:53
  • Go higher - 192k. – Jay Jennings Aug 29 '18 at 21:45

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