Sorry, just wanted to clarify a bit. I again made a very primitive test circuit, 200 hz sine wave generator connected to pitch shifter, which is in turn connected to the output. All the values of the shifter were intact. 300 samples delay, 100 shift range, I connected the whole thing to my oscilloscope, and when I move the slider - nothing happens! Absolutely no any change. Just wanted to ask, whether the shifter is ready and working? Or I did something wrong? Just found only one topic about this algorithm and judging by the posts there it should be working, so I do not understand.