Question about effects and reading data to the buffer

Question about effects and reading data to the buffer

[Lakomkin Egor]

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Hello,

I am trying to programmatically load an audio file, apply tempo effect and
read the output to the buffer for the further processing. I uploaded the
gist of the example here:
https://gist.github.com/EgorLakomkin/124a4b86dd8869d5536e2edceec0cc84
If I use tempo values < 1 I get the correct number of samples from the
output, but if I change it for example to 1.2 I suddenly get a very small
number of sample and 0 if I use the value of 1.0. I am wondering if there
is a bug in my chain configuration or data reading from the output? It is
my first experience with libsox and I tried to follow examples, but I got
stuck here.

Thank you in advance for the help!

Regards, Egor

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