Hey Alex,

Have you seen this article before?

https://www.surina.net/article/time-and-pitch-scaling.html 
<https://www.surina.net/article/time-and-pitch-scaling.html>

It has a complete and detailed description on how time and pitch scaling works.

Hope it helps! 

Best regards,

Nuno 

> On 1 Oct 2018, at 17:30, Alex Dashevski <alexd...@gmail.com> wrote:
> 
> Hi,
> 
> I got this answer from Robert:
> WSOLA fundamentally does time-scaling.  time compression or time stretching 
> without changing pitch.  time-scaling is not normally thought of as real-time 
> because your input and output buffer pointers will collide.
> 
> 
> My question is:
> Why buffers will collide ?
> 
> Thanks,
> Alex
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