Because Zathras-1 now has to interact with linearly interpolated timestretches, we had to calculate the latency of our timestretcher.

Multiple results were new to me and interesting to see.

1. An sliding window fourier transform has a latency of 0. I did not expect that at all.
2. When an input frame is stretched, then each sample of the inputframe will have  a different latency.
3. The latencies of all samples, except the middle one, depend on the playback speed. Yes, you read that right: the playback speed affects the latency. And that is really something we do not want to compensate for. Therefore, use as reference the middle of the frame.
4. It is possible to have negative latencies. Part of the signal is already out before we believe we provided it to the timestretcher.

http://werner.yellowcouch.org/Papers/zathras15/#toc23