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Mar 8 '17 at 22:30 comment added hobbs @AndrewCheong technically that's true, but not on the scale that you're thinking about. Rubberband (which is one of the best time-stretcher/pitch-shifters generally available) adds a delay of about 2-4 milliseconds when working with 44k or 48k input and stretching by a reasonable amount. Not enough to cause a perceptible difference between changing the control and hearing the result, unless some other part of the stack is causing the delay.
Mar 8 '17 at 15:26 comment added Andrew Cheong @DarrenRinger - Thanks. I didn't know about timbre changes; interesting. As I just posted in a comment under the question, I'm not aware of live mixing software with auto-pitch shifting. I wonder if it's because, when it comes to bpm shifts, all it needs do is change the sample rate, i.e. drop samples or play slower, whereas pitch-shifting requires more complex transformations that require lag when administered live, e.g. user enables auto-pitch, auto-pitch doesn't actually start until 3.5 seconds later to create enough buffer for pitch-shifting ahead; still subject to CPU interruptions...
Mar 8 '17 at 13:55 comment added Darren Ringer Indeed. Changing the tempo with software designed for it can adjust to nearly any speed you wish without any perceivable change in tonality (the timbre of individual notes will start to suffer at slow speeds depending on the algorithm they used). Changing the tempo simply by speeding up or slowing down the waveform will always change the key of the original music, but it will still remain "in tune with itself". In this way, songs in one key may be shifted into a different key by accordingly increasing or decreasing their speed. Of course, there are also tools that do this at fixed tempo.
Mar 8 '17 at 12:21 comment added Tetsujin at 30 cents my ears would be screaming for the horrible noise to stop. Can't you use software that can change tempo without altering pitch?
Mar 8 '17 at 11:30 comment added Andrew Cheong Thanks! I guess my ears don't work so great under a semitone :^) I did read on some DJ forum that practically, you don't want to tempo shift more than 2 bpm if you plan to mix by key. Kind of makes sense now, as 2 bpm = 30 cents according to your figures. (I'm rounding to 15 cents / bpm, for easier math.) Maybe about 30 cents of relative off-tunedness is the limit before even a layman starts hearing that notes sound "wrong" / not good.
Mar 8 '17 at 9:32 history answered user37548 CC BY-SA 3.0